--- a/server/hook.py	Wed May 09 16:35:46 2012 +0200
+++ b/server/hook.py	Wed May 09 16:43:48 2012 +0200
@@ -273,7 +273,8 @@
 RELATIONS_HOOKS = set(('before_add_relation',   'after_add_relation' ,
                        'before_delete_relation','after_delete_relation'))
 SYSTEM_HOOKS = set(('server_backup', 'server_restore',
-                    'server_startup', 'server_maintenance', 'server_shutdown',
+                    'server_startup', 'server_maintenance',
+                    'server_shutdown', 'before_server_shutdown',
                     'session_open', 'session_close'))
 ALL_HOOKS = ENTITIES_HOOKS | RELATIONS_HOOKS | SYSTEM_HOOKS
 

--- a/server/repository.py	Wed May 09 16:35:46 2012 +0200
+++ b/server/repository.py	Wed May 09 16:43:48 2012 +0200
@@ -425,6 +425,10 @@
         connections
         """
         assert not self.shutting_down, 'already shutting down'
+        if not (self.config.creating or self.config.repairing
+                or self.config.quick_start):
+            # then, the system source is still available
+            self.hm.call_hooks('before_server_shutdown', repo=self)
         self.shutting_down = True
         self.system_source.shutdown()
         if self._tasks_manager is not None: