1 files changed, 16 insertions, 0 deletions
diff --git a/zuul/source/__init__.py b/zuul/source/__init__.py
index faf97b48b..dd11aa9b6 100644
--- a/zuul/source/__init__.py
+++ b/zuul/source/__init__.py
@@ -15,6 +15,8 @@
 import abc
 import time
 
+from zuul import model
+
 
 class BaseSource(object, metaclass=abc.ABCMeta):
     """Base class for sources.
@@ -183,6 +185,20 @@ class BaseSource(object, metaclass=abc.ABCMeta):
 
         """
 
+    def getProjectMergeModes(self, project, tenant, min_ltime=-1):
+        """Get supported merge modes for a project
+
+        This method is called very frequently, and should generally
+        return quickly.  The connection is expected to cache merge
+        modes for all projects queried.
+
+        The default implementation indicates that all merge modes are
+        supported.
+
+        """
+
+        return model.ALL_MERGE_MODES
+
     @abc.abstractmethod
     def getProjectBranchCacheLtime(self):
         """Return the current ltime of the project branch cache."""