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Auto-loading the Julia module

On Noctua, the julia executable is only available after loading a Julia module (see Julia: Getting Started). To use the Julia VS Code extension within a VS Code SSH remote session you must make sure that a Julia module is automatically loaded when the Julia Language Server starts (i.e. when opening or creating a Julia file) or when you open the Julia REPL (i.e. Julia: Start REPL). This can be done by pointing the extension to a wrapper script which loads the module and then starts julia.

Specifically, create a file julia_wrapper.sh with the following content

#!/bin/bash
# ------------------------------------------------------------
export MODULEPATH=/etc/modulefiles:/usr/share/modulefiles || :
source /usr/share/lmod/lmod/init/profile
if [ -f "/opt/software/pc2/lmod/modules/DefaultModules.lua" ];then
        export MODULEPATH="$MODULEPATH:/opt/software/pc2/lmod/modules"
        export LMOD_SYSTEM_DEFAULT_MODULES="DefaultModules"
else
        if [ -f "/usr/share/modulefiles/StdEnv.lua" ];then
                export LMOD_SYSTEM_DEFAULT_MODULES="StdEnv"
        fi
fi
module --initial_load restore
# ------------------------------------------------------------

module load lang
module load JuliaHPC # or module load Julia

exec julia "${@}"

and make the “Executable Path” setting of the Julia extension (julia.executablePath) point to this file. (Note: The first block makes the module command available.)

Using a direnv environment with the integrated Julia REPL

Modify the script above to the following:

#!/bin/bash
# ------------------------------------------------------------
export MODULEPATH=/etc/modulefiles:/usr/share/modulefiles || :
source /usr/share/lmod/lmod/init/profile
if [ -f "/opt/software/pc2/lmod/modules/DefaultModules.lua" ];then
        export MODULEPATH="$MODULEPATH:/opt/software/pc2/lmod/modules"
        export LMOD_SYSTEM_DEFAULT_MODULES="DefaultModules"
else
        if [ -f "/usr/share/modulefiles/StdEnv.lua" ];then
                export LMOD_SYSTEM_DEFAULT_MODULES="StdEnv"
        fi
fi
module --initial_load restore
# ------------------------------------------------------------

DIRENV=$HOME/.local/bin/direnv # path to you direnv binary
export DIRENV_BASH=/bin/bash

ml lang
ml JuliaHPC

if [ -z "${JULIA_LANGUAGESERVER}" ]; then
    # REPL process; use direnv exec to load .envrc file
    exec "${DIRENV}" exec "${PWD}" julia "${@}"
else
    # Language Server process; exec the fallback julia
    exec julia "${@}"
fi

This will load the direnv environment when starting the integrated Julia REPL (and only the JuliaHPC module when starting the Julia Language Server).

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