Remove six

This wasn't actually recorded in our list of dependencies, but we were
using it all the same. In any case, it's no longer necessary so remove
it.

Change-Id: Ia29fdf5058c2b22327cb0ba16c28bef3660e9ceb
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

oslo_privsep/comm.py

@@ -25,7 +25,6 @@ import socket
 import threading
 
 import msgpack
-import six
 
 from oslo_privsep._i18n import _
 
@@ -62,7 +61,7 @@ class Serializer(object):
         self.writesock.shutdown(socket.SHUT_WR)
 
 
-class Deserializer(six.Iterator):
+class Deserializer(object):
     def __init__(self, readsock):
         self.readsock = readsock
         self.unpacker = msgpack.Unpacker(use_list=False, raw=False,
@@ -182,7 +181,7 @@ class ClientChannel(object):
         self.reader_thread.join()
 
 
-class ServerChannel(six.Iterator):
+class ServerChannel(object):
     """Server-side twin to ClientChannel"""
 
     def __init__(self, sock):

oslo_privsep/daemon.py

@@ -62,7 +62,6 @@ from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_utils import encodeutils
 from oslo_utils import importutils
-import six
 
 from oslo_privsep._i18n import _
 from oslo_privsep import capabilities
@@ -521,8 +520,8 @@ class Daemon(object):
                 reply = (Message.ERR.value, cls_name, e.args)
                 try:
                     channel.send((msgid, reply))
-                except IOError:
-                    self.communication_error = sys.exc_info()
+                except IOError as exc:
+                    self.communication_error = exc
 
         return _call_back
 
@@ -537,10 +536,10 @@ class Daemon(object):
         for msgid, msg in self.channel:
             error = self.communication_error
             if error:
-                if error[1].errno == errno.EPIPE:
+                if error.errno == errno.EPIPE:
                     # Write stream closed, exit loop
                     break
-                six.reraise(*error)
+                raise error
 
             # Submit the command for execution
             future = self.thread_pool.submit(self._process_cmd, msgid, *msg)

oslo_privsep/tests/test_comm.py

@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import six
+import io
 
 from oslotest import base
 
@@ -22,7 +22,7 @@ from oslo_privsep import comm
 class BufSock(object):
     def __init__(self):
         self.readpos = 0
-        self.buf = six.BytesIO()
+        self.buf = io.BytesIO()
 
     def recv(self, bufsize):
         if self.buf.closed:

oslo_privsep/tests/test_daemon.py

@@ -25,7 +25,6 @@ from unittest import mock
 from oslo_log import formatters
 from oslo_log import log as logging
 from oslotest import base
-import six
 import testtools
 
 from oslo_privsep import capabilities
@@ -189,12 +188,12 @@ class WithContextTest(testctx.TestContextTestCase):
 class ClientChannelTestCase(base.BaseTestCase):
 
     DICT = {
-        'string_1': ('tuple_1', six.b('tuple_2')),
-        six.b('byte_1'): ['list_1', 'list_2'],
+        'string_1': ('tuple_1', b'tuple_2'),
+        b'byte_1': ['list_1', 'list_2'],
     }
 
     EXPECTED = {
-        'string_1': ('tuple_1', six.b('tuple_2')),
+        'string_1': ('tuple_1', b'tuple_2'),
         'byte_1': ['list_1', 'list_2'],
     }