#
#
# patch "tracvc/mtn/automate.py"
#  from [d041a51cc889c12614f9f52bad708e049e3d0cf7]
#    to [cddf03c360177a4888e6c37ceb621bd530817cc2]
# 
# patch "tracvc/mtn/backend.py"
#  from [a14f49afc8c292e539e11bd31843019150418069]
#    to [1c2aa4564b3363992365328435e85c764cf5527e]
#
============================================================
--- tracvc/mtn/automate.py	d041a51cc889c12614f9f52bad708e049e3d0cf7
+++ tracvc/mtn/automate.py	cddf03c360177a4888e6c37ceb621bd530817cc2
@@ -145,6 +145,7 @@ class MTN(object):
         self.automate = Automate(database, binary)
         self.log = log
         self.roots_cache = []
+        self.interface_version = None
 
     def leaves(self):
         """Returns a list containing the current leaves."""
@@ -329,9 +330,12 @@ class MTN(object):
                 revs.append(values[0])
         return revs
 
-    def interface_version(self):
+    def get_interface_version(self):
         """Returns the automation interface version."""
-        return self.automate.command("interface_version").strip()
+        if not self.interface_version:
+            self.interface_version = self.automate.command(
+                "interface_version").strip()
+        return self.interface_version
 
 
 class Changeset(object):
============================================================
--- tracvc/mtn/backend.py	a14f49afc8c292e539e11bd31843019150418069
+++ tracvc/mtn/backend.py	1c2aa4564b3363992365328435e85c764cf5527e
@@ -123,7 +123,7 @@ class MonotoneConnector(Component):
         # this is the main entry point for users of this plugin, so let's set
         # version information here
         if not self.version:
-            interface_version = self.repos[path].interface_version()
+            interface_version = self.repos[path].get_interface_version()
             monotone_version = INTERFACE_VERSIONS.get(interface_version, None)
             if monotone_version:
                interface_version += " [guessed version %s]" % monotone_version
@@ -447,11 +447,11 @@ class MonotoneRepository(Repository):
         """
         return dates(self.mtn.certs(rev).get('date', []))
 
-    def interface_version(self):
+    def get_interface_version(self):
         """
         Returns the automation interface version string.
         """
-        return self.mtn.interface_version()
+        return self.mtn.get_interface_version()
 
 
 class MonotoneNode(Node):