handle push error properly

If there was some error during pushing then Kolla was greeting with "all went
fine" message anyway:

INFO:kolla.common.utils.aodh-api:Trying to push the image
ERROR:kolla.common.utils.aodh-api:Get http://10.101.16.1:5000/v2/: dial tcp 10.101.16.1:5000: connect: no route to host
INFO:kolla.common.utils.aodh-api:Pushed successfully

This patch changes that. Now if there is an error during push then proper
exception is raised to PushTask and image is marked with PUSH_ERROR status.

This way at the end of build it is easy to spot which images did not got
pushed to registry:

INFO:kolla.common.utils:===========================
INFO:kolla.common.utils:Images that failed to build
INFO:kolla.common.utils:===========================
ERROR:kolla.common.utils:base Failed with status: push_error
ERROR:kolla.common.utils:nova-api Failed with status: push_error
ERROR:kolla.common.utils:nova-base Failed with status: push_error
ERROR:kolla.common.utils:nova-compute Failed with status: push_error
ERROR:kolla.common.utils:nova-compute-ironic Failed with status: push_error
ERROR:kolla.common.utils:nova-conductor Failed with status: push_error

Closes-Bug: #1848019
Change-Id: Id2ab97bf4c0dc3423268a0ea435b56f4a65f7196
(cherry picked from commit 52cac09d3d)

kolla/image/build.py

@@ -317,6 +317,11 @@ class PushIntoQueueTask(task.Task):
         self.success = True
 
 
+class PushError(Exception):
+    """Raised when there is a problem with pushing image to repository."""
+    pass
+
+
 class PushTask(DockerTask):
     """Task that pushes an image to a docker repository."""
 
@@ -340,6 +345,9 @@ class PushTask(DockerTask):
                                   ' have the correct privileges to run Docker'
                                   ' (root)')
             image.status = STATUS_CONNECTION_ERROR
+        except PushError as exception:
+            self.logger.error(exception)
+            image.status = STATUS_PUSH_ERROR
         except Exception:
             self.logger.exception('Unknown error when pushing')
             image.status = STATUS_PUSH_ERROR
@@ -364,8 +372,7 @@ class PushTask(DockerTask):
             if 'stream' in response:
                 self.logger.info(response['stream'])
             elif 'errorDetail' in response:
-                image.status = STATUS_ERROR
-                self.logger.error(response['errorDetail']['message'])
+                raise PushError(response['errorDetail']['message'])
 
         # Reset any previous errors.
         image.status = STATUS_BUILT

kolla/tests/test_build.py

@@ -83,6 +83,7 @@ class TasksTest(base.TestCase):
     @mock.patch.dict(os.environ, clear=True)
     @mock.patch('docker.APIClient')
     def test_push_image_failure(self, mock_client):
+        """failure on connecting Docker API"""
         self.dc = mock_client
         mock_client().push.side_effect = Exception
         pusher = build.PushTask(self.conf, self.image)
@@ -96,6 +97,7 @@ class TasksTest(base.TestCase):
     @mock.patch.dict(os.environ, clear=True)
     @mock.patch('docker.APIClient')
     def test_push_image_failure_retry(self, mock_client):
+        """failure on connecting Docker API, success on retry"""
         self.dc = mock_client
         mock_client().push.side_effect = [Exception, []]
         pusher = build.PushTask(self.conf, self.image)
@@ -112,6 +114,44 @@ class TasksTest(base.TestCase):
         self.assertTrue(pusher.success)
         self.assertEqual(build.STATUS_BUILT, self.image.status)
 
+    @mock.patch('docker.version', '3.0.0')
+    @mock.patch.dict(os.environ, clear=True)
+    @mock.patch('docker.APIClient')
+    def test_push_image_failure_error(self, mock_client):
+        """Docker connected, failure to push"""
+        self.dc = mock_client
+        mock_client().push.return_value = [{'errorDetail': {'message':
+                                                            'mock push fail'}}]
+        pusher = build.PushTask(self.conf, self.image)
+        pusher.run()
+        mock_client().push.assert_called_once_with(
+            self.image.canonical_name, decode=True, stream=True)
+        self.assertFalse(pusher.success)
+        self.assertEqual(build.STATUS_PUSH_ERROR, self.image.status)
+
+    @mock.patch('docker.version', '3.0.0')
+    @mock.patch.dict(os.environ, clear=True)
+    @mock.patch('docker.APIClient')
+    def test_push_image_failure_error_retry(self, mock_client):
+        """Docker connected, failure to push, success on retry"""
+        self.dc = mock_client
+        mock_client().push.return_value = [{'errorDetail': {'message':
+                                                            'mock push fail'}}]
+        pusher = build.PushTask(self.conf, self.image)
+        pusher.run()
+        mock_client().push.assert_called_once_with(
+            self.image.canonical_name, decode=True, stream=True)
+        self.assertFalse(pusher.success)
+        self.assertEqual(build.STATUS_PUSH_ERROR, self.image.status)
+
+        # Try again, this time without exception.
+        mock_client().push.return_value = [{'stream': 'mock push passes'}]
+        pusher.reset()
+        pusher.run()
+        self.assertEqual(2, mock_client().push.call_count)
+        self.assertTrue(pusher.success)
+        self.assertEqual(build.STATUS_BUILT, self.image.status)
+
     @mock.patch.dict(os.environ, clear=True)
     @mock.patch('docker.APIClient')
     def test_build_image(self, mock_client):