Support communicating with rstudio via unix socket instead of tcp socket

[jhgoebbert]

This PR only adds the part for unix-socket-support from #151 as @yuvipanda asked in #151 (comment) to better split it.

It enables RStudio connections via sockets in combination with this PR for RStudio rstudio/rstudio#14938 which is part of the official release RStudio v2024.12.0+467.

[yuvipanda]

Excellent @jhgoebbert! The code looks good to me, am spinning up my local test env and will merge once I can verify it.

Thank you so much for your patience!

[yuvipanda]

@jhgoebbert ok, tested this and it looks fine! I have one suggestion that I made as a PR to your repo: jhgoebbert#1.

If that seems ok to you, and you merge that, I'm happy to merge this PR!

[yuvipanda]

This is the Dockerfile I used for testing:

FROM rocker/binder:4

COPY . /tmp/src

USER root

RUN /opt/venv/bin/python3 -m pip install -U -e /tmp/src

USER rstudio

Then I build it with docker buildx build --platform linux/amd64 -t wat .

Then I could run it like docker run -e JUPYTER_RSESSION_PROXY_USE_SOCKET=no -p 8888:8888 -it wat (or other env vars as appropriate)

[yuvipanda]

Thank you very very much, @jhgoebbert! Would love a PR with the rest of your initial contribution too!

[jhgoebbert]

Thank you for merging this, @yuvipanda
I have created another PR with the rest here #160

[yuvipanda]

@jhgoebbert I opened #161 to turn this feature on by default!

[yuvipanda]

Thanks to @sgibson91 there is a new release out now!