Here are links to DockerSpawner and SingularitySpawner. The latter allows 
the user to specify the path to the Singularity image they want to use. 

https://github.com/jupyterhub/dockerspawner
https://github.com/ResearchComputing/jupyterhub-singularity-spawner

You can override the text field in the form with radio buttons, here's an 
example of that:

https://github.com/ericblau/jupyterhub-singularity-spawner/blob/master/singularityspawner/singularityspawner.py

--Rick

On Friday, August 3, 2018 at 6:53:48 PM UTC-5, [email protected] wrote:
>
> Hi, 
>
> You don’t need to run separate JupyterHub instances, you can achieve this 
> by using a spawner that launches either the traditional Notebook Server or 
> JupyterLab. A container spawner like Docker or Singularity works well for 
> this use case. The user can be pretty prompted to select which one they 
> want to spawn. 
>
> I’ll try to find a link to post with an example implementation. 
>
> —Rick 
>

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