Rename BuildExecutor.identifer ➡️ builder_info

binderhub/base.py

@@ -244,11 +244,11 @@ class VersionHandler(BaseHandler):
 
     async def get(self):
         self.set_header("Content-type", "application/json")
-        self.write(
-            json.dumps(
-                {
-                    "builder": self.settings["example_builder"].identifier,
-                    "binderhub": binder_version,
-                }
-            )
-        )
+        r = {
+            "builder_info": self.settings["example_builder"].builder_info,
+            "binderhub": binder_version,
+        }
+        # Backwards compatibility
+        if "build_image" in r["builder_info"]:
+            r["builder"] = r["builder_info"]["build_image"]
+        self.write(json.dumps(r))

binderhub/build.py

@@ -101,10 +101,9 @@ class BuildExecutor(LoggingConfigurable):
         config=True,
     )
 
-    identifier = Unicode(
-        "",
+    builder_info = Dict(
         help=(
-            "Identifier or other metadata for the builder e.g. repo2docker version. "
+            "Metadata about the builder e.g. repo2docker version. "
             "This is included in the BinderHub version endpoint"
         ),
         config=True,
@@ -248,9 +247,9 @@ def _default_namespace(self):
         config=True,
     )
 
-    @default("identifier")
-    def _default_identifier(self):
-        return self.build_image
+    @default("builder_info")
+    def _default_builder_info(self):
+        return {"build_image": self.build_image}
 
     docker_host = Unicode(
         "/var/run/docker.sock",

binderhub/build_local.py

@@ -112,15 +112,15 @@ class LocalRepo2dockerBuild(BuildExecutor):
     WARNING: This is still under development. Breaking changes may be made at any time.
     """
 
-    @default("identifier")
-    def _default_identifier(self):
+    @default("builder_info")
+    def _default_builder_info(self):
         try:
             import repo2docker
 
-            return repo2docker.__version__
+            return {"repo2docker-version": repo2docker.__version__}
         except ImportError:
             self.log.error("repo2docker not installed")
-            return ""
+            return {}
 
     def submit(self):
         """