Merge pull request #3385 from mtmail/docs-reverse-only

[nominatim.git] / nominatim / tools / database_import.py

diff --git a/nominatim/tools/database_import.py b/nominatim/tools/database_import.py
index cb620d41fb8f31126fe69a622bf14130e38494d1..de7e6a4aa2018c06e7284b4120973351b8a04ea5 100644 (file)
--- a/nominatim/tools/database_import.py
+++ b/nominatim/tools/database_import.py
@@ -23,7 +23,8 @@ from nominatim.db.async_connection import DBConnection
 from nominatim.db.sql_preprocessor import SQLPreprocessor
 from nominatim.tools.exec_utils import run_osm2pgsql
 from nominatim.errors import UsageError
-from nominatim.version import POSTGRESQL_REQUIRED_VERSION, POSTGIS_REQUIRED_VERSION
+from nominatim.version import POSTGRESQL_REQUIRED_VERSION, \
+                              POSTGIS_REQUIRED_VERSION
 
 LOG = logging.getLogger()
 
@@ -38,6 +39,25 @@ def _require_version(module: str, actual: Tuple[int, int], expected: Tuple[int,
         raise UsageError(f'{module} is too old.')
 
 
+def _require_loaded(extension_name: str, conn: Connection) -> None:
+    """ Check that the given extension is loaded. """
+    if not conn.extension_loaded(extension_name):
+        LOG.fatal('Required module %s is not loaded.', extension_name)
+        raise UsageError(f'{extension_name} is not loaded.')
+
+
+def check_existing_database_plugins(dsn: str) -> None:
+    """ Check that the database has the required plugins installed."""
+    with connect(dsn) as conn:
+        _require_version('PostgreSQL server',
+                         conn.server_version_tuple(),
+                         POSTGRESQL_REQUIRED_VERSION)
+        _require_version('PostGIS',
+                         conn.postgis_version_tuple(),
+                         POSTGIS_REQUIRED_VERSION)
+        _require_loaded('hstore', conn)
+
+
 def setup_database_skeleton(dsn: str, rouser: Optional[str] = None) -> None:
     """ Create a new database for Nominatim and populate it with the
         essential extensions.