port replication update function to python

nominatim/tools/exec_utils.py

@@ -2,10 +2,13 @@
 Helper functions for executing external programs.
 """
 import logging
+import os
 import subprocess
 import urllib.request as urlrequest
 from urllib.parse import urlencode
 
+from psycopg2.extensions import parse_dsn
+
 from ..version import NOMINATIM_VERSION
 
 LOG = logging.getLogger()
@@ -87,6 +90,41 @@ def run_api_script(endpoint, project_dir, extra_env=None, phpcgi_bin=None,
     return 0
 
 
+def run_osm2pgsql(options):
+    """ Run osm2pgsql with the given options.
+    """
+    env = os.environ
+    cmd = [options['osm2pgsql'],
+           '--hstore', '--latlon', '--slim',
+           '--with-forward-dependencies', 'false',
+           '--log-progress', 'true',
+           '--number-processes', str(options['threads']),
+           '--cache', str(options['osm2pgsql_cache']),
+           '--output', 'gazetteer',
+           '--style', str(options['osm2pgsql_style'])
+          ]
+    if options['append']:
+        cmd.append('--append')
+
+    if options['flatnode_file']:
+        cmd.extend(('--flat-nodes', options['flatnode_file']))
+
+    dsn = parse_dsn(options['dsn'])
+    if 'password' in dsn:
+        env['PGPASSWORD'] = dsn['password']
+    if 'dbname' in dsn:
+        cmd.extend(('-d', dsn['dbname']))
+    if 'user' in dsn:
+        cmd.extend(('--username', dsn['user']))
+    for param in ('host', 'port'):
+        if param in dsn:
+            cmd.extend(('--' + param, dsn[param]))
+
+    cmd.append(str(options['import_file']))
+
+    subprocess.run(cmd, cwd=options.get('cwd', '.'), env=env, check=True)
+
+
 def get_url(url):
     """ Get the contents from the given URL and return it as a UTF-8 string.
     """