Make options discoverable

Add the oslo.config entry point so that these options can be discovered
by oslo-config-generator. Add a simple tox env to generate a sample
config file with the available options. This file may be placed in
/etc/nova/conf.d to inject these options into the nova services.

Change-Id: I05b564418f3b9334e6a8033b52f165b8bab2eabf
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

.gitignore

@@ -33,3 +33,5 @@ pip-log.txt
 
 AUTHORS
 ChangeLog
+
+etc/blazar-nova.conf.sample

blazarnova/_opts.py

@@ -0,0 +1,21 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import blazarnova.scheduler.filters.blazar_filter
+
+
+def list_opts():
+    return [
+        ('blazar:physical:host',
+         blazarnova.scheduler.filters.blazar_filter.opts),
+    ]

etc/blazar-nova-config-generator.conf

@@ -0,0 +1,4 @@
+[DEFAULT]
+output_file = etc/blazar-nova.conf.sample
+wrap_width = 80
+namespace = blazarnova

pyproject.toml

@@ -30,3 +30,7 @@ Repository = "https://opendev.org/openstack/blazar-nova"
 
 [tool.setuptools.packages.find]
 include = ["blazarnova*"]
+
+[project.entry-points."oslo.config.opts"]
+"blazarnova" = "blazarnova._opts:list_opts"
+

tox.ini

@@ -1,7 +1,6 @@
 [tox]
 envlist = py3,pep8
 minversion = 3.18.0
-skipsdist = True
 
 [testenv]
 usedevelop = True
@@ -34,6 +33,9 @@ commands = flake8 {posargs}
 [testenv:venv]
 commands = {posargs}
 
+[testenv:genconfig]
+commands = oslo-config-generator --config-file=etc/blazar-nova-config-generator.conf
+
 [flake8]
 show-source = true
 builtins = _