sagemath mybinder error

[mmosmond]

Bug description

Hello! Thanks for the great resource. I was using mybinder to host Jupyter Notebooks with SageMath kernels over at https://github.com/mmosmond/eeb430, but this stopped working sometime in September. Other repos with SageMath + mybinder have stopped working as well: https://github.com/calculuslab/Calculus_Lab, https://github.com/sagemath/sage-binder-env

Expected behaviour

In early September my binder badge (https://mybinder.org/v2/gh/mmosmond/eeb430/HEAD) successfully launched my notebooks in the browser.

Actual behaviour

Now binder gets stuck and never opens the notebook.

How to reproduce

1. Go to https://mybinder.org/v2/gh/mmosmond/eeb430/HEAD
2. The logs are:

Found built image, launching...
Launching server...
Server requested
2021-10-06T20:09:04.129014Z [Normal] Successfully assigned prod/jupyter-mmosmond-2deeb430-2dupce478r to gke-prod-user-202009-b9c03ca0-22tw
2021-10-06T20:09:05Z [Normal] Container image "jupyterhub/mybinder.org-tc-init:2020.12.4-n655.hfe65496" already present on machine
2021-10-06T20:09:05Z [Normal] Created container tc-init
2021-10-06T20:09:05Z [Normal] Started container tc-init
2021-10-06T20:09:06Z [Normal] Container image "gcr.io/binderhub-288415/r2d-staging-g5b5b759-mmosmond-2deeb430-159f2f:8a9a33ff11965174a9ef9ed7173ebf64a3bf62a4" already present on machine
2021-10-06T20:09:06Z [Normal] Created container notebook
2021-10-06T20:09:06Z [Normal] Started container notebook

Your personal set up

My Dockerfile is:

FROM sagemath/sagemath:latest
COPY --chown=sage:sage . ${HOME}

I've tried multiple versions of sagemath as well as jupyterlab, but alas...

There was some suspicion over at sagemath/sage-binder-env#9 that this was a mybinder issue.

Thanks for any help you can give!

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[betatim]

This is probably related to mybinder.org switching to Jupyter Lab by default. I don't know how to fix it though. There are a few threads in the forum http://discourse.jupyter.org/ about how to move a repo to the new setup/make it compatible with the new setup. That is where I'd go digging