Always load api-paste.ini from config directory

The file is not a python code but is actually a config file, so it
should be placed in /etc .

This migration allows us to get rid of pkg_resources which was removed
in Python 3.12 .

doc/source/conf.py

@@ -10,7 +10,16 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import pkg_resources
+import importlib.metadata
+
+from oslo_config import cfg
+
+ROOT = os.path.abspath(os.path.join(os.path.abspath(__file__), '..', '..')
+cfg.CONF.import_opt('api_paste', 'gnocchi.opts', 'api')
+cfg.CONF.set_override(
+    name='api_paste',
+    override=os.path.join(ROOT, 'etc', 'gnocchi', 'api-paste.ini'),
+    group='api')
 
 # -- General configuration -----------------------------------------------------
 
@@ -38,7 +47,7 @@
 # built documents.
 #
 # The short X.Y version.
-release = pkg_resources.get_distribution('gnocchi').version
+release = importlib.metadata.version('gnocchi').version
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.

gnocchi/rest/app.py

@@ -15,7 +15,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 import os
-import pkg_resources
 import threading
 import uuid
 
@@ -165,9 +164,7 @@ def load_app(conf, not_implemented_middleware=True):
         cfg_path = conf.find_file(cfg_path)
 
     if cfg_path is None or not os.path.exists(cfg_path):
-        LOG.debug("No api-paste configuration file found! Using default.")
-        cfg_path = os.path.abspath(pkg_resources.resource_filename(
-            __name__, "api-paste.ini"))
+        raise RuntimeError("No api-paste configuration file found!")
 
     config = dict(conf=conf,
                   not_implemented_middleware=not_implemented_middleware)

gnocchi/tests/base.py

@@ -286,8 +286,13 @@ def setUp(self):
             logging_level=logging.DEBUG,
             skip_log_opts=True)
 
+        self.conf.set_override(
+            'paste_config',
+            os.path.abspath(
+                os.path.join(os.path.dirname(__file__), '..', '..',
+                             'etc', 'gnocchi', 'api-paste.ini')),
+            group='api')
         self.index = indexer.get_driver(self.conf)
-
         self.coord = metricd.get_coordinator_and_start(
             str(uuid.uuid4()),
             self.conf.coordination_url)

setup.cfg

@@ -19,6 +19,11 @@ classifier =
     Programming Language :: Python :: 3.11
     Topic :: System :: Monitoring
 
+[files]
+data_files =
+    etc/gnocchi =
+        etc/gnocchi/api-paste.ini
+
 [options]
 packages =
     gnocchi