test changing the windows temp dir

[IanButterworth]

Adds test for #205

Should fail on windows on master

[IanButterworth]

@cderv would you be able to help get this reproducing the issue.

Also see question here https://github.com/julia-actions/setup-julia/pull/206#issuecomment-1892878567

[cderv]

yes, I'll try to diagnose further the issue of why /usr/bin/tar is used in my workflow. Maybe it is not the temp dir at all.

I'll look at #206 also.

[cderv]

So I spent my morning trying to understand deeper what was happening, and it was in fact an unexpected configuration and conflict between two actions:

• https://github.com/r-lib/actions/tree/v2/setup-r will modified the PATH by default to add some tools and it includes a tar
• https://github.com/julia-actions/setup-julia will use any tar found on PATH for untar from D: (RUNNER_TEMP) to C:\hostedtoolcache\windows

So if I tweak/fix the PATH before Julia setup action, I can make it work.

Workflow file if you want to try it yourself

name: test-julia-install
on: [workflow_dispatch]

jobs:
  install:
    runs-on: windows-latest
    name: Test Julia install on windows
    steps:
      - uses: actions/checkout@v4
      - run: $env:PATH -Split ";"
        shell: powershell
      - run: gcm tar
        shell: powershell
      - uses: r-lib/actions/setup-r@v2
        # uncomment the following line to fix julia setup 
        # but it will have side effect probably on R setup
        # with:
        #  windows-path-include-rtools: false
      - run: $env:PATH -Split ";"
        shell: powershell
      - run: gcm tar
        shell: powershell
      - uses: julia-actions/setup-julia@v1
        with:
          version: '1.10'

However, I believe it is still not ideal for julia-actions/setup-julia to use a tar that could be incompatible with the expected command https://github.com/julia-actions/setup-julia/blob/a1561e938c17e7aaf8236334d6d533e774c71dcd/dist/index.js#L271

• juliaDownloadPath will be in D: as it is based on RUNNER_TEMP by default through tc.downloadTool() https://github.com/julia-actions/setup-julia/blob/a1561e938c17e7aaf8236334d6d533e774c71dcd/dist/index.js#L234-L236

• dest will be a folder in the hostedtoolcache folder on C: https://github.com/julia-actions/setup-julia/blob/a1561e938c17e7aaf8236334d6d533e774c71dcd/dist/index.js#L429-L439

So either ensuring the right tar is used or the same drive is used could be safer.

Sorry for the trouble in the first place.