Address python3 pylint errors and warnings

This commit addresses issues detected by the updated python3 pylint:
- Added a return code to the report_app_dependencies function to
satisfy the E1111 error reported.
- Added line-specific pylint disable for unused-argument for cases
where the inclusion of such arguments in the function signature was
intentional.
- Added line-specific pylint disable for the duplicate-except case
found, as python3 has merged IOError into OSError, while these are
separate exceptions in python2. Once we're running solely on python3,
this duplicate exception handling can be dropped.

Change-Id: I96a521288e71948f06ad0c88a12c8f475ed8bc99
Closes-Bug: 1855180
Signed-off-by: Don Penney <don.penney@windriver.com>

cgcs-patch/cgcs-patch/cgcs_patch/api/controllers/root.py

@@ -182,7 +182,7 @@ class PatchAPIController(object):
 
     @expose('json')
     @expose('query_hosts.xml', content_type='application/xml')
-    def query_hosts(self, *args):
+    def query_hosts(self, *args):  # pylint: disable=unused-argument
         return dict(data=pc.query_host_cache())
 
     @expose('json')
@@ -197,7 +197,7 @@ class PatchAPIController(object):
 
     @expose('json')
     @expose('query.xml', content_type='application/xml')
-    def host_install(self, *args):
+    def host_install(self, *args):  # pylint: disable=unused-argument
         return dict(error="Deprecated: Use host_install_async")
 
     @expose('json')

cgcs-patch/cgcs-patch/cgcs_patch/messages.py

@@ -60,5 +60,5 @@ class PatchMessage(object):
             return PATCHMSG_STR[self.msgtype]
         return "invalid-type"
 
-    def handle(self, sock, addr):
+    def handle(self, sock, addr):  # pylint: disable=unused-argument
         LOG.info("Unhandled message type: %s" % self.msgtype)

cgcs-patch/cgcs-patch/cgcs_patch/patch_agent.py

@@ -151,7 +151,7 @@ class PatchMessageHelloAgent(messages.PatchMessage):
         resp = PatchMessageHelloAgentAck()
         resp.send(sock)
 
-    def send(self, sock):
+    def send(self, sock):  # pylint: disable=unused-argument
         LOG.error("Should not get here")
 
 
@@ -197,7 +197,7 @@ class PatchMessageQueryDetailed(messages.PatchMessage):
         resp = PatchMessageQueryDetailedResp()
         resp.send(sock)
 
-    def send(self, sock):
+    def send(self, sock):  # pylint: disable=unused-argument
         LOG.error("Should not get here")
 
 
@@ -259,7 +259,7 @@ class PatchMessageAgentInstallReq(messages.PatchMessage):
         resp.status = pa.handle_install()
         resp.send(sock, addr)
 
-    def send(self, sock):
+    def send(self, sock):  # pylint: disable=unused-argument
         LOG.error("Should not get here")
 
 

cgcs-patch/cgcs-patch/cgcs_patch/patch_client.py

@@ -960,7 +960,7 @@ def wait_for_install_complete(agent_ip):
     return rc
 
 
-def host_install(debug, args):
+def host_install(debug, args):  # pylint: disable=unused-argument
     force = False
     rc = 0
 
@@ -1072,7 +1072,7 @@ def patch_upload_dir_req(debug, args):
     return check_rc(req)
 
 
-def patch_install_local(debug, args):
+def patch_install_local(debug, args):  # pylint: disable=unused-argument
     """ This function is used to trigger patch installation prior to configuration """
     # Check to see if initial configuration has completed
     if os.path.isfile(INITIAL_CONTROLLER_CONFIG_COMPLETE):
@@ -1214,7 +1214,7 @@ def patch_is_available_req(args):
     return rc
 
 
-def patch_report_app_dependencies_req(debug, args):
+def patch_report_app_dependencies_req(debug, args):  # pylint: disable=unused-argument
     if len(args) < 2:
         print_help()
 

cgcs-patch/cgcs-patch/cgcs_patch/patch_controller.py

@@ -392,7 +392,7 @@ class PatchMessageHelloAgentAck(messages.PatchMessage):
                                  self.agent_state)
         pc.hosts_lock.release()
 
-    def send(self, sock):
+    def send(self, sock):  # pylint: disable=unused-argument
         LOG.error("Should not get here")
 
 
@@ -469,7 +469,7 @@ class PatchMessageQueryDetailedResp(messages.PatchMessage):
         else:
             pc.hosts_lock.release()
 
-    def send(self, sock):
+    def send(self, sock):  # pylint: disable=unused-argument
         LOG.error("Should not get here")
 
 
@@ -525,7 +525,7 @@ class PatchMessageAgentInstallResp(messages.PatchMessage):
         pc.hosts[addr[0]].install_reject_reason = self.reject_reason
         pc.hosts_lock.release()
 
-    def send(self, sock):
+    def send(self, sock):  # pylint: disable=unused-argument
         LOG.error("Should not get here")
 
 
@@ -2298,6 +2298,8 @@ class PatchController(PatchService):
         finally:
             self.patch_data_lock.release()
 
+        return True
+
     def query_app_dependencies(self):
         """
         Query application dependencies

cgcs-patch/cgcs-patch/cgcs_patch/patch_functions.py

@@ -1235,7 +1235,7 @@ class PatchFile(object):
             msg = "Failed during patch extraction"
             LOG.exception(msg)
             raise PatchFail(msg)
-        except IOError:
+        except IOError:  # pylint: disable=duplicate-except
             msg = "Failed during patch extraction"
             LOG.exception(msg)
             raise PatchFail(msg)

cgcs-patch/cgcs-patch/cgcs_patch/tests/test_patch_controller.py

@@ -19,6 +19,6 @@ import cgcs_patch.patch_controller  # noqa: E402
 class CgcsPatchControllerTestCase(testtools.TestCase):
 
     @mock.patch('six.moves.builtins.open')
-    def test_cgcs_patch_controller_instantiate(self, mock_open):
+    def test_cgcs_patch_controller_instantiate(self, mock_open):  # pylint: disable=unused-argument
         # pylint: disable=unused-variable
         pc = cgcs_patch.patch_controller.PatchController()  # noqa: F841

cgcs-patch/cgcs-patch/pylint.rc

@@ -44,16 +44,12 @@ symbols=no
 # --enable=similarities". If you want to run only the classes checker, but have
 # no Warning level messages displayed, use"--disable=all --enable=classes
 # --disable=W"
-# E1111 assignment-from-no-return
 # W0107 unnecessary-pass
 # W0603 global-statement
-# W0612 unused-variable
-# W0613 unused-argument
 # W0703 broad-except
-# W0705 duplicate-except
 # W1201 logging-not-lazy
 # W1505, deprecated-method
-disable=C, R, E1111, W0107, W0603, W0612, W0613, W0703, W0705, W1201, W1505
+disable=C, R, W0107, W0603, W0703, W1201, W1505
 
 
 [REPORTS]