Added upgrade step executed before schmema is upgraded

Class PreSchemaUpdate is executed before ldap schema update

This is required by ticket: https://fedorahosted.org/freeipa/ticket/3210

Reviewed-By: Martin Kosek <mkosek@redhat.com>

2 files changed, 15 insertions, 1 deletions

diff --git a/ipaserver/install/plugins/__init__.py b/ipaserver/install/plugins/__init__.py
index 49bef4df8..210c56ef7 100644
--- a/ipaserver/install/plugins/__init__.py
+++ b/ipaserver/install/plugins/__init__.py
@@ -20,6 +20,7 @@
 """
 Provide a separate api for updates.
 """
+PRE_SCHEMA_UPDATE = 0
 PRE_UPDATE = 1
 POST_UPDATE = 2
 
diff --git a/ipaserver/install/plugins/baseupdate.py b/ipaserver/install/plugins/baseupdate.py
index a480a8ee2..dc6672ac5 100644
--- a/ipaserver/install/plugins/baseupdate.py
+++ b/ipaserver/install/plugins/baseupdate.py
@@ -20,7 +20,8 @@
 from ipalib import api
 from ipalib import Updater, Object
 from ipaserver.install import service
-from ipaserver.install.plugins import PRE_UPDATE, POST_UPDATE, MIDDLE
+from ipaserver.install.plugins import (PRE_UPDATE, POST_UPDATE,
+                                       PRE_SCHEMA_UPDATE, MIDDLE)
 
 class DSRestart(service.Service):
     """
@@ -55,6 +56,18 @@ class update(Object):
 
 api.register(update)
 
+
+class PreSchemaUpdate(Updater):
+    """
+    Base class for updates that run after file processing.
+    """
+    updatetype = PRE_SCHEMA_UPDATE
+    order = MIDDLE
+
+    def __init__(self):
+        super(PreSchemaUpdate, self).__init__()
+
+
 class PreUpdate(Updater):
     """
     Base class for updates that run prior to file processing.