Fix image plugin functionality for oslo.config

The new oslo.config style parsing for kolla-build.conf stopped plugins
from working. This patch fixes it and adds a unit test.

Co-Authored-By: Jeffrey Zhang <zhang.lei.fly@gmail.com>
Closes-Bug: 1534556
Change-Id: I135797c733ae0cae040a009c364073769b19e4eb

kolla/cmd/build.py

@@ -604,7 +604,9 @@ class KollaWorker(object):
                 for plugin in [match.group(0) for match in
                                (re.search('{}-plugin-.+'.format(image['name']),
                                           section) for section in
-                               self.conf._groups) if match]:
+                               self.conf.list_all_sections()) if match]:
+                    self.conf.register_opts(common_config.get_source_opts(),
+                                            plugin)
                     image['plugins'].append(
                         process_source_installation(image, plugin))
 

kolla/tests/base.py

@@ -11,6 +11,9 @@
 # limitations under the License.
 
 import os
+
+import fixtures
+import mock
 from oslo_config import cfg
 from oslotest import base as oslotest_base
 
@@ -30,6 +33,11 @@ class TestCase(oslotest_base.BaseTestCase):
         default_config_files = self.get_default_config_files()
         common_config.parse(self.conf, [],
                             default_config_files=default_config_files)
+        # NOTE(jeffrey4l): mock the _get_image_dir method to return a fake
+        # docker images dir
+        self.useFixture(fixtures.MockPatch(
+            'kolla.cmd.build.KollaWorker._get_images_dir',
+            mock.Mock(return_value=os.path.join(TESTS_ROOT, 'docker'))))
 
     def get_default_config_files(self):
         if self.config_file:

kolla/tests/docker/base/Dockerfile.j2

@@ -0,0 +1 @@
+FROM {{ base_distro }}:{{ base_distro_tag }}

kolla/tests/docker/neutron-server/Dockerfile.j2

@@ -0,0 +1 @@
+FROM {{ namespace }}/{{ image_prefix }}base:{{ tag }}

kolla/tests/etc/default.conf

@@ -1,2 +1,7 @@
 [DEFAULT]
 debug=True
+
+[neutron-server-plugin-networking-arista]
+reference = master
+location = https://github.com/openstack/networking-arista
+type = git

kolla/tests/test_build.py

@@ -107,6 +107,8 @@ class WorkerThreadTest(base.TestCase):
 
 class KollaWorkerTest(base.TestCase):
 
+    config_file = 'default.conf'
+
     def test_supported_base_type(self):
         rh_base = ['fedora', 'centos', 'oraclelinux', 'rhel']
         rh_type = ['source', 'binary', 'rdo', 'rhos']
@@ -128,3 +130,25 @@ class KollaWorkerTest(base.TestCase):
             self.conf.set_override('install_type', install_type)
             self.assertRaises(build.KollaMismatchBaseTypeException,
                               build.KollaWorker, self.conf)
+
+    def test_build_image_list_adds_plugins(self):
+
+        self.conf.set_override('install_type', 'source')
+
+        kolla = build.KollaWorker(self.conf)
+        kolla.setup_working_dir()
+        kolla.find_dockerfiles()
+        kolla.create_dockerfiles()
+        kolla.build_image_list()
+        expected_plugin = {
+            'name': 'neutron-server-plugin-networking-arista',
+            'reference': 'master',
+            'source': 'https://github.com/openstack/networking-arista',
+            'type': 'git'
+        }
+        for image in kolla.images:
+            if image['name'] == 'neutron-server':
+                self.assertEqual(image['plugins'][0], expected_plugin)
+                break
+        else:
+            self.fail('Can not find the expected neutron arista plugin')