port database setup function to python

Hide the former PHP functions in a transition command until
they are removed.

nominatim/clicmd/transition.py

@@ -0,0 +1,53 @@
+"""
+Implementation of the 'transition' subcommand.
+
+This subcommand provides standins for functions that were available
+through the PHP scripts but are now no longer directly accessible.
+This module will be removed as soon as the transition phase is over.
+"""
+import logging
+
+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
+
+LOG = logging.getLogger()
+
+class AdminTransition:
+    """\
+    Internal functions for code transition. Do not use.
+    """
+
+    @staticmethod
+    def add_args(parser):
+        group = parser.add_argument_group('Sub-functions')
+        group.add_argument('--create-db', action='store_true',
+                           help='Create nominatim db')
+        group.add_argument('--setup-db', action='store_true',
+                           help='Build a blank nominatim db')
+        group = parser.add_argument_group('Options')
+        group.add_argument('--no-partitions', action='store_true',
+                           help='Do not partition search indices')
+
+    @staticmethod
+    def run(args):
+        from ..tools import database_import
+
+        if args.create_db:
+            LOG.warning('Create DB')
+            database_import.create_db(args.config.get_libpq_dsn())
+
+        if args.setup_db:
+            LOG.warning('Setup DB')
+            mpath = database_import.install_module(args.module_dir, args.project_dir,
+                                                   args.config.DATABASE_MODULE_PATH)
+
+            with connect(args.config.get_libpq_dsn()) as conn:
+                database_import.setup_extensions(conn)
+                database_import.check_module_dir_path(conn, mpath)
+
+            database_import.import_base_data(args.config.get_libpq_dsn(),
+                                             args.data_dir, args.no_partitions)