Fix LocalRepo2dockerBuild to work with latest BuildExecutor

Author: manics

binderhub/build_local.py

@@ -11,6 +11,7 @@
 from threading import Thread
 
 from tornado.log import app_log
+from traitlets import default
 
 from .build import BuildExecutor, ProgressEvent
 
@@ -111,6 +112,15 @@ class LocalRepo2dockerBuild(BuildExecutor):
     WARNING: This is still under development. Breaking changes may be made at any time.
     """
 
+    @default("identifier")
+    def _identifier_default(self):
+        try:
+            import repo2docker
+
+            return repo2docker.__version__
+        except ImportError:
+            return ""
+
     def submit(self):
         """
         Run a build to create the image for the repository.

testing/local-binder-local-hub/binderhub_config.py

@@ -24,7 +24,7 @@
 c.BinderHub.builder_required = False
 
 c.BinderHub.build_class = LocalRepo2dockerBuild
-c.BinderHub.push_secret = None
+c.BinderHub.push_secret = ""
 c.BinderHub.launch_quota_class = LaunchQuota
 
 c.BinderHub.about_message = "This is a local dev deployment without Kubernetes"