dbcheck: skip find_missing_forward_links_from_backlinks() if the db has the sortedLinks feature

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13228

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Mon Feb  5 18:32:51 CET 2018 on sn-devel-144

(cherry picked from commit 0c3348feb09f4f0ba85455b8c3ff5c5fa60d139b)

1 files changed, 25 insertions, 0 deletions

diff --git a/python/samba/dbchecker.py b/python/samba/dbchecker.py
index c2c95a2e859..b2b8b0c9558 100644
--- a/python/samba/dbchecker.py
+++ b/python/samba/dbchecker.py
@@ -186,6 +186,23 @@ class dbcheck(object):
         else:
             self.rid_set_dn = None
 
+        self.compatibleFeatures = []
+        self.requiredFeatures = []
+
+        try:
+            res = self.samdb.search(scope=ldb.SCOPE_BASE,
+                                    base="@SAMBA_DSDB",
+                                    attrs=["compatibleFeatures",
+                                    "requiredFeatures"])
+            if "compatibleFeatures" in res[0]:
+                self.compatibleFeatures = res[0]["compatibleFeatures"]
+            if "requiredFeatures" in res[0]:
+                self.requiredFeatures = res[0]["requiredFeatures"]
+        except ldb.LdbError as (enum, estr):
+            if enum != ldb.ERR_NO_SUCH_OBJECT:
+                raise
+            pass
+
     def check_database(self, DN=None, scope=ldb.SCOPE_SUBTREE, controls=[], attrs=['*']):
         '''perform a database check, returning the number of errors found'''
         res = self.samdb.search(base=DN, scope=scope, attrs=['dn'], controls=controls)
@@ -745,6 +762,9 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn), str(to_base)))
         if self.do_modify(m, ["local_oid:1.3.6.1.4.1.7165.4.3.19.2:1"],
                 "Failed to fix duplicate links in attribute '%s'" % forward_attr):
             self.report("Fixed duplicate links in attribute '%s'" % (forward_attr))
+            duplicate_cache_key = "%s:%s" % (str(obj.dn), forward_attr)
+            assert duplicate_cache_key in self.duplicate_link_cache
+            self.duplicate_link_cache[duplicate_cache_key] = False
 
     def err_no_fsmoRoleOwner(self, obj):
         '''handle a missing fSMORoleOwner'''
@@ -1011,6 +1031,11 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn), str(to_base)))
                         forward_syntax)
             return (missing_forward_links, error_count)
 
+        if "sortedLinks" in self.compatibleFeatures:
+            self.report("Not checking for missing forward links because the db " + \
+                        "has the sortedLinks feature")
+            return (missing_forward_links, error_count)
+
         try:
             obj_guid = obj['objectGUID'][0]
             obj_guid_str = str(ndr_unpack(misc.GUID, obj_guid))