svn-support: Only add reload-cmd subscriber if a reload command is set.

If no reload command is set in the ini file there is no need
to add the subscriber to the event.

rhodecode/svn_support/__init__.py

@@ -1,88 +1,89 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2016-2016  RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 import logging
 import os
 import shlex
 
 # Do not use `from rhodecode import events` here, it will be overridden by the
 # events module in this package due to pythons import mechanism.
 from rhodecode.events import RepoGroupEvent
 from rhodecode.subscribers import AsyncSubprocessSubscriber
 from rhodecode.config.middleware import (
     _bool_setting, _string_setting, _int_setting)
 
 from .events import ModDavSvnConfigChange
 from .subscribers import generate_config_subscriber
 from . import config_keys
 
 
 log = logging.getLogger(__name__)
 
 
 def includeme(config):
     settings = config.registry.settings
     _sanitize_settings_and_apply_defaults(settings)
 
     if settings[config_keys.generate_config]:
         # Add subscriber to generate the Apache mod dav svn configuration on
         # repository group events.
         config.add_subscriber(generate_config_subscriber, RepoGroupEvent)
 
-        # Prepare reload command to pass it to the subprocess module and add a
-        # subscriber to execute it on configuration changes.
+        # If a reload command is set add a subscriber to execute it on
+        # configuration changes.
         reload_cmd = shlex.split(settings[config_keys.reload_command])
+        if reload_cmd:
         reload_timeout = settings[config_keys.reload_timeout] or None
-        config_change_subscriber = AsyncSubprocessSubscriber(
+            reload_subscriber = AsyncSubprocessSubscriber(
             cmd=reload_cmd, timeout=reload_timeout)
-        config.add_subscriber(config_change_subscriber, ModDavSvnConfigChange)
+            config.add_subscriber(reload_subscriber, ModDavSvnConfigChange)
 
 
 def _sanitize_settings_and_apply_defaults(settings):
     """
     Set defaults, convert to python types and validate settings.
     """
     _bool_setting(settings, config_keys.generate_config, 'false')
     _bool_setting(settings, config_keys.list_parent_path, 'true')
     _int_setting(settings, config_keys.reload_timeout, 10)
     _string_setting(settings, config_keys.config_file_path, '', lower=False)
     _string_setting(settings, config_keys.location_root, '/', lower=False)
     _string_setting(settings, config_keys.reload_command, '', lower=False)
 
     # Convert negative timeout values to zero.
     if settings[config_keys.reload_timeout] < 0:
         settings[config_keys.reload_timeout] = 0
 
     # Append path separator to location root.
     settings[config_keys.location_root] = _append_path_sep(
         settings[config_keys.location_root])
 
     # Validate settings.
     if settings[config_keys.generate_config]:
         assert len(settings[config_keys.config_file_path]) > 0
 
 
 def _append_path_sep(path):
     """
     Append the path separator if missing.
     """
     if isinstance(path, basestring) and not path.endswith(os.path.sep):
         path += os.path.sep
     return path