From 1242b26266b5f1222924dc06479e19d0914a0703 Mon Sep 17 00:00:00 2001
From: David Kupka <dkupka@redhat.com>
Date: Wed, 27 Jul 2016 10:54:16 +0200
Subject: [PATCH] schema: Introduce schema cache format

Information about schema cache format is stored in every cache item.
When schema cache format changes in incompatible way format will be
increased. When format stored in cache doesn't match currently used
format the entry in cache is ignored.

https://fedorahosted.org/freeipa/ticket/6048

Reviewed-By: Jan Cholasta <jcholast@redhat.com>
---
 ipaclient/remote_plugins/schema.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ipaclient/remote_plugins/schema.py b/ipaclient/remote_plugins/schema.py
index f165736cde6f08d6d22c17070d570da261799e4b..d7c018e3de1cc79ffc086e3576542ce993ebc87a 100644
--- a/ipaclient/remote_plugins/schema.py
+++ b/ipaclient/remote_plugins/schema.py
@@ -23,6 +23,8 @@ from ipapython.dn import DN
 from ipapython.dnsutil import DNSName
 from ipapython.ipa_log_manager import log_mgr
 
+FORMAT = '0'
+
 if six.PY3:
     unicode = str
 
@@ -478,6 +480,14 @@ class Schema(object):
         return _LockedZipFile(path, mode)
 
     def _get_schema_fingerprint(self, schema):
+        try:
+            fmt = json.loads(schema.read('format'))
+        except KeyError:
+            fmt = '0'
+
+        if fmt != FORMAT:
+            raise RuntimeError('invalid format')
+
         schema_info = json.loads(schema.read(self.schema_info_path))
         return schema_info['fingerprint']
 
-- 
2.7.4