Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found.

Remove hacking and friends from lower-constraints, they are not needed
for installation.

Change-Id: If75153300f07e6d1c5bf433af35a0dd4d98e6c7f

benchmark/benchmark.py

@@ -63,6 +63,7 @@ def run_one(runner, cmd):
         assert code == 0, "Command failed"
     return __inner
 
+
 runners = [
     ("{0}", run_plain),
     ("sudo {0}", run_sudo),
@@ -109,5 +110,6 @@ def main():
     atexit.register(run_sudo, ["ip", "netns", "delete", "bench_ns"])
     run_bench('ip netns exec bench_ns ip a'.split(), runners[1:])
 
+
 if __name__ == "__main__":
     main()

lower-constraints.txt

@@ -7,11 +7,9 @@ dulwich==0.15.0
 eventlet==0.18.2
 extras==1.0.0
 fixtures==3.0.0
-flake8==2.5.5
 gitdb==0.6.4
 GitPython==1.0.1
 greenlet==0.4.10
-hacking==0.12.0
 imagesize==0.7.1
 iso8601==0.1.11
 Jinja2==2.10
@@ -24,8 +22,6 @@ openstackdocstheme==1.20.0
 os-client-config==1.28.0
 oslotest==3.2.0
 pbr==2.0.0
-pep8==1.5.7
-pyflakes==0.8.1
 Pygments==2.2.0
 python-mimeparse==1.6.0
 python-subunit==1.0.0

oslo_rootwrap/jsonrpc.py

@@ -96,6 +96,7 @@ class JsonListener(object):
     def get_accepted(self):
         return self._accepted
 
+
 if hasattr(managers.Server, 'accepter'):
     # In Python 3 accepter() thread has infinite loop. We break it with
     # EOFError, so we should silence this error here.
@@ -118,10 +119,10 @@ class JsonConnection(object):
         self._socket.sendall(s)
 
     def recv_bytes(self, maxsize=None):
-        l = struct.unpack('!Q', self.recvall(8))[0]
+        item = struct.unpack('!Q', self.recvall(8))[0]
-        if maxsize is not None and l > maxsize:
+        if maxsize is not None and item > maxsize:
             raise RuntimeError("Too big message received")
-        s = self.recvall(l)
+        s = self.recvall(item)
         return s
 
     def send(self, obj):

oslo_rootwrap/tests/run_daemon.py

@@ -49,6 +49,7 @@ class nonclosing(object):
     def close(self):
         pass
 
+
 log_format = ("%(asctime)s | [%(process)5s]+%(levelname)5s | "
               "%(message)s")
 if __name__ == '__main__':

oslo_rootwrap/tests/test_rootwrap.py

@@ -398,7 +398,7 @@ class RootwrapTestCase(testtools.TestCase):
 
     def test_ChainingRegExpFilter_match(self):
         filter_list = [filters.ChainingRegExpFilter('nice', 'root',
-                                                    'nice', '-?\d+'),
+                                                    'nice', r'-?\d+'),
                        filters.CommandFilter('cat', 'root')]
         args = ['nice', '5', 'cat', '/a']
         dirs = ['/bin', '/usr/bin']
@@ -407,7 +407,7 @@ class RootwrapTestCase(testtools.TestCase):
 
     def test_ChainingRegExpFilter_not_match(self):
         filter_list = [filters.ChainingRegExpFilter('nice', 'root',
-                                                    'nice', '-?\d+'),
+                                                    'nice', r'-?\d+'),
                        filters.CommandFilter('cat', 'root')]
         args_invalid = (['nice', '5', 'ls', '/a'],
                         ['nice', '--5', 'cat', '/a'],

test-requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 
 fixtures>=3.0.0 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT

tox.ini

@@ -50,9 +50,9 @@ commands =
 
 [flake8]
 # E731 skipped as assign a lambda expression
-
+# W504 line break after binary operator
 show-source = True
-ignore = E731
+ignore = E731,W504
 exclude = .tox,dist,doc,*.egg,build
 
 [testenv:benchmark]