feat: include configuration files in package

setup.cfg

@@ -21,14 +21,18 @@ classifiers =
     Operating System :: Unix
 
 [options]
+packages = find:
 package_dir =
     = src
-packages = find:
-python_requires = >=3.6.9
+include_package_data = True
+python_requires = >=3.10.0
 
 [options.packages.find]
 where = src
 
+[options.package_data]
+de.p1st.monitor = data/*.ini
+
 [options.entry_points]
 ; https://setuptools.readthedocs.io/en/latest/userguide/entry_point.html
 console_scripts=

src/de/p1st/monitor/cfg/singleton.py

@@ -2,22 +2,34 @@
 # -*- coding: utf-8 -*-
 import configparser
 from pathlib import Path
+import importlib.resources as importlib_resources
 
 _cfg: configparser.ConfigParser | None = None
 
 
 def init_cfg(config_file: Path = None):
     global _cfg
-
     if _cfg is not None:
-        raise ValueError('already initialized')
+        raise ValueError('Already initialized.')
 
+    # Use the given config file.
+
+    # Otherwise, use config file from /etc/de-p1st-monitor/.
     if config_file is None:
         import socket
-        hostname = socket.gethostname()
+        hostname: str = socket.gethostname()
         config_file = Path(f'/etc/de-p1st-monitor/{hostname}.ini')
+        if not config_file.is_file():
+            config_file = None
 
-    if not config_file.exists():
+    # Otherwise, use packaged config file.
+    if config_file is None:
+        pkg = importlib_resources.files('de.p1st.monitor')
+        config_file = pkg / 'data' / f'{hostname}.ini'
+        if not config_file.is_file():
+            config_file = None
+
+    if config_file is None or not config_file.is_file():
         raise Exception(f'Configuration file does not exist! {config_file}')
 
     _cfg = configparser.ConfigParser()