Update repo2docker (Python 3.10 by default) and BinderHub (switch to jupyter-server)

mybinder/Chart.yaml

@@ -8,7 +8,7 @@ dependencies:
   # Source code:    https://github.com/jupyterhub/binderhub/tree/main/helm-chart
   # App changelog:  https://github.com/jupyterhub/binderhub/blob/main/CHANGES.md
   - name: binderhub
-    version: "1.0.0-0.dev.git.3018.he00ec49"
+    version: "1.0.0-0.dev.git.3025.h276be90"
     repository: https://jupyterhub.github.io/helm-chart
 
   # Ingress-Nginx to route network traffic according to Ingress resources using

mybinder/values.yaml

@@ -160,7 +160,7 @@ binderhub:
 
     BinderHub:
       use_registry: true
-      build_image: quay.io/jupyterhub/repo2docker:2022.10.0-113.g8c0f49e
+      build_image: quay.io/jupyterhub/repo2docker:2022.10.0-128.g4c6b5bc
       per_repo_quota: 100
       per_repo_quota_higher: 200
       cors_allow_origin: "*"
@@ -347,27 +347,6 @@ binderhub:
         enabled: true
         # replicas set in config/<deployment>
     singleuser:
-      cmd:
-        - python3
-        - "-c"
-        - |
-          import os
-          import sys
-
-          try:
-              import jupyterlab
-              major = int(jupyterlab.__version__.split(".", 1)[0])
-          except Exception:
-              have_lab = False
-          else:
-              have_lab = major >= 3
-
-          if have_lab:
-              # if recent-enough lab is available, make it the default UI
-              sys.argv.insert(1, "--NotebookApp.default_url=/lab/")
-
-          # launch the notebook server
-          os.execvp("jupyter-notebook", sys.argv)
       # clear singleuser.defaultUrl config from chart
       defaultUrl:
       cloudMetadata:

tests/test_launch.py

@@ -11,7 +11,7 @@ def test_launch_binder(binder_url):
     """
     # Known good version of this repo
     repo = "binder-examples/requirements"
-    ref = "fa84f12"
+    ref = "50533eb"
     build_url = binder_url + f"/build/gh/{repo}/{ref}"
     r = requests.get(build_url, stream=True)
     r.raise_for_status()