have ADDRESS_LEVEL_CONFIG use load_sub_configuration

This means that relative paths now are looked up in the
project directory.

nominatim/clicmd/refresh.py

@@ -75,10 +75,9 @@ class UpdateRefresh:
             self._get_tokenizer(args.config).update_statistics()
 
         if args.address_levels:
-            cfg = Path(args.config.ADDRESS_LEVEL_CONFIG)
-            LOG.warning('Updating address levels from %s', cfg)
+            LOG.warning('Updating address levels')
             with connect(args.config.get_libpq_dsn()) as conn:
-                refresh.load_address_levels_from_file(conn, cfg)
+                refresh.load_address_levels_from_config(conn, args.config)
 
         if args.functions:
             LOG.warning('Create functions')

nominatim/clicmd/setup.py

@@ -150,7 +150,7 @@ class SetupAll:
             refresh.create_functions(conn, config, False, False)
             LOG.warning('Create tables')
             database_import.create_tables(conn, config, reverse_only=reverse_only)
-            refresh.load_address_levels_from_file(conn, Path(config.ADDRESS_LEVEL_CONFIG))
+            refresh.load_address_levels_from_config(conn, config)
             LOG.warning('Create functions (2nd pass)')
             refresh.create_functions(conn, config, False, False)
             LOG.warning('Create table triggers')

nominatim/config.py

@@ -56,12 +56,6 @@ class Configuration:
         if project_dir is not None and (project_dir / '.env').is_file():
             self._config.update(dotenv_values(str((project_dir / '.env').resolve())))
 
-        # Add defaults for variables that are left empty to set the default.
-        # They may still be overwritten by environment variables.
-        if not self._config['NOMINATIM_ADDRESS_LEVEL_CONFIG']:
-            self._config['NOMINATIM_ADDRESS_LEVEL_CONFIG'] = \
-                str(config_dir / 'address-levels.json')
-
         class _LibDirs:
             pass
 

nominatim/tools/refresh.py

@@ -1,7 +1,6 @@
 """
 Functions for bringing auxiliary data in the database up-to-date.
 """
-import json
 import logging
 from textwrap import dedent
 
@@ -58,12 +57,15 @@ def load_address_levels(conn, table, levels):
 
     conn.commit()
 
-def load_address_levels_from_file(conn, config_file):
-    """ Replace the `address_levels` table with the contents of the config
-        file.
+
+def load_address_levels_from_config(conn, config):
+    """ Replace the `address_levels` table with the content as
+        defined in the given configuration. Uses the parameter
+        NOMINATIM_ADDRESS_LEVEL_CONFIG to determine the location of the
+        configuration file.
     """
-    with config_file.open('r') as fdesc:
-        load_address_levels(conn, 'address_levels', json.load(fdesc))
+    cfg = config.load_sub_configuration('', config='ADDRESS_LEVEL_CONFIG')
+    load_address_levels(conn, 'address_levels', cfg)
 
 
 def create_functions(conn, config, enable_diff_updates=True, enable_debug=False):