Try to read config from /etc/dibbler/dibbler.conf

dibbler/conf.py

@@ -1,6 +1,25 @@
 # This module is supposed to act as a singleton and be filled
 # with config variables by cli.py
+from pathlib import Path
+import os
 
 import configparser
 
 config = configparser.ConfigParser()
+
+DEFAULT_CONFIG_PATH = Path('/etc/dibbler/dibbler.conf')
+
+def default_config_path_submissive_and_readable() -> bool:
+    return DEFAULT_CONFIG_PATH.is_file() and any(
+        [
+            (
+                DEFAULT_CONFIG_PATH.stat().st_mode & 0o400
+                and DEFAULT_CONFIG_PATH.stat().st_uid == os.getuid()
+            ),
+            (
+                DEFAULT_CONFIG_PATH.stat().st_mode & 0o040
+                and DEFAULT_CONFIG_PATH.stat().st_gid == os.getgid()
+            ),
+            (DEFAULT_CONFIG_PATH.stat().st_mode & 0o004),
+        ]
+    )

dibbler/main.py

@@ -1,6 +1,7 @@
 import argparse
+import sys
 
-from dibbler.conf import config
+from dibbler.conf import DEFAULT_CONFIG_PATH, config, default_config_path_submissive_and_readable
 
 parser = argparse.ArgumentParser()
 
@@ -25,7 +26,13 @@ subparsers.add_parser("seed-data", help="Fill with mock data")
 
 def main():
     args = parser.parse_args()
-    config.read(args.config)
+
+    if args.config is not None:
+        config.read(args.config)
+    elif default_config_path_submissive_and_readable():
+        config.read(DEFAULT_CONFIG_PATH)
+    else:
+        print("Could not read config file, it was neither provided nor readable in default location", file=sys.stderr)
 
     if args.subcommand == "loop":
         import dibbler.subcommands.loop as loop