Get directory of the notebook initialising the kernel in remote_ikernel

[divyansshhh]

Problem

I have a fork of remote_ikernel which I use to connect to a kernel on a remote host. I also have a contents manager that overrides the / directory to mount a virtual filesystem (this is not a physical location on disk) so when I open a notebook from this virtual filesystem, remote_ikernel thinks the cwd is /, which is incorrect.

(the notebook path could be from something like - /<virtual-dir-prefix>/u/$USER/Untitled.ipynb, I expect the cwd to be /u/$USER/ on the remote host but it is set to /)

I want a way to communicate to remote_ikernel what the correct path is.

Proposed Solution

I propose adding an environment variable (say, JPY_NOTEBOOK_DIR) which I can use in my fork of remote_ikernel to switch to the correct cwd.

Additional context

I have tried using a custom SessionManager to do this but the current implementation adds alot of maintenance overhead to keep our version in sync with the latest releases of jupyter_server. Hence I propose making the change in jupyter_server itself.

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