port freeze function to python

nominatim/clicmd/__init__.py

@@ -7,3 +7,4 @@ from .api import APISearch, APIReverse, APILookup, APIDetails, APIStatus
 from .index import UpdateIndex
 from .refresh import UpdateRefresh
 from .admin import AdminFuncs
+from .freeze import SetupFreeze

nominatim/clicmd/freeze.py

@@ -0,0 +1,37 @@
+"""
+Implementation of the 'freeze' subcommand.
+"""
+
+from ..db.connection import connect
+
+# Do not repeat documentation of subcommand classes.
+# pylint: disable=C0111
+# Using non-top-level imports to avoid eventually unused imports.
+# pylint: disable=E0012,C0415
+
+class SetupFreeze:
+    """\
+    Make database read-only.
+
+    About half of data in the Nominatim database is kept only to be able to
+    keep the data up-to-date with new changes made in OpenStreetMap. This
+    command drops all this data and only keeps the part needed for geocoding
+    itself.
+
+    This command has the same effect as the `--no-updates` option for imports.
+    """
+
+    @staticmethod
+    def add_args(parser):
+        pass # No options
+
+    @staticmethod
+    def run(args):
+        from ..tools import freeze
+
+        conn = connect(args.config.get_libpq_dsn())
+        freeze.drop_update_tables(conn)
+        freeze.drop_flatnode_file(args.config.FLATNODE_FILE)
+        conn.close()
+
+        return 0