Unable to start OCAML kernel in WSL, Mac, Linux

[DonJayamanne]

Environment data

• VS Code version: 1.64
• Jupyter Extension version (available under the Extensions sidebar): Latest
• Python Extension version (available under the Extensions sidebar): Latest
• OS (Windows | Mac | Linux distro) and version: WSL (Ubuntu)
• Python and/or Anaconda version: 3.8
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): Venv
• Jupyter server running: Local

Expected behaviour

Able to run ocaml kernel

Actual behaviour

Does not run

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

1. Install ocaml as per instructions here https://akabe.github.io/ocaml-jupyter/
2. Run Jupyter in terminal and ocaml will work
3. Run OCAML kernel in VS Code and it will not work.

[DonJayamanne]

It doesn't seem to work as opam hasn't been initialized. When launched from the shell we have shell initialization scripts, hence opam is initialized. However in VS Code inside WSL there's no such thing, hence env variables are not as expected.

[DonJayamanne]

TODO

• [No] Does this work on Windows?
  • Not officially supported, hence not looking into windows.
• Does this work on linux/mac desktop?
  • no, same problem

[IanMatthewHuff]

Reporting back on Mac.

Also doesn't work here, and I see the same basic symptom (I believe) as Don regarding shell initialization. Same kernel worked ok for me launching from shell with jupyter notebook.

Info 11:34:05: Process Execution: > /bin/sh -c "eval $(opam env --switch=default --shell=sh) && /Users/ianhuff/.opam/default/bin/ocaml-jupyter-kernel "$@"" ocaml-jupyter-kernel -init ~/.ocamlinit --merlin ~/.opam/default/bin/ocamlmerlin --verbosity app --connection-file /var/folders/q7/cn8fg6s94fgdcl0h7rbxldf00000gn/T/tmp-9387031XBpCbVv4Yg.json
> /bin/sh -c "eval $(opam env --switch=default --shell=sh) && /Users/ianhuff/.opam/default/bin/ocaml-jupyter-kernel "$@"" ocaml-jupyter-kernel -init ~/.ocamlinit --merlin ~/.opam/default/bin/ocamlmerlin --verbosity app --connection-file /var/folders/q7/cn8fg6s94fgdcl0h7rbxldf00000gn/T/tmp-9387031XBpCbVv4Yg.json
Info 11:34:05: Process Execution: cwd: ~/Documents/DataScience/Languages/OCAML
cwd: ~/Documents/DataScience/Languages/OCAML
Verbose 11:34:05: Launching kernel in kernelProcess.ts, Class name = x, completed in 3ms, has a truthy return value, Arg 1: "~/Documents/DataScience/Languages/OCAML", Arg 2: ""
Verbose 11:34:05: KernelProcess error: ocaml-jupyter-kernel: eval OPAM_SWITCH_PREFIX='/Users/ianhuff/.opam/default'; export OPAM_SWITCH_PREFIX;
CAML_LD_LIBRARY_PATH='/Users/ianhuff/.opam/default/lib/stublibs:/Users/ianhuff/.opam/default/lib/ocaml/stublibs:/Users/ianhuff/.opam/default/lib/ocaml'; export CAML_LD_LIBRARY_PATH;
OCAML_TOPLEVEL_PATH='/Users/ianhuff/.opam/default/lib/toplevel'; export OCAML_TOPLEVEL_PATH;
PKG_CONFIG_PATH='/Users/ianhuff/.opam/default/lib/pkgconfig'; export PKG_CONFIG_PATH;
PATH='/Users/ianhuff/.opam/default/bin:/Users/ianhuff/Documents/DataScience/Languages/OCAML/.venv/bin:/Users/ianhuff/.nvm/versions/node/v14.17.1/bin:/Library/Frameworks/Python.framework/Versions/2.7/bin:/usr/local/texlive/2020:/Users/ianhuff/opt/miniconda3/condabin:/Library/Frameworks/Python.framework/Versions/3.7/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/usr/local/share/dotnet:~/.dotnet/tools'; export PATH; && /Users/ianhuff/.opam/default/bin/ocaml-jupyter-kernel -init: No such file or directory

[DonJayamanne]

@TimMcGilly thanks for the confirmation, basically its installed in WSL, not windows. Thanks,
I believe I have a fix for this, once I have something ready for testing, i'll ping you.

[IanMatthewHuff]

LGTM on Mac

[DonJayamanne]

Solution - Exit VS Code completely & then reload VS Code.