SPACK_ROOT not set

[AlexanderRichert-NOAA]

It seems SPACK_ROOT isn't set by this action. Is that intentional? The following workflow shows nothing for SPACK_ROOT (https://github.com/AlexanderRichert-NOAA/ci-playground/actions/runs/19686556436/job/56393323435):

name: Test

on: [push, pull_request, workflow_dispatch]

jobs:
  test:
    runs-on: ubuntu-24.04
    steps:
      - uses: spack/setup-spack@v2

      - name: Run tests
        shell: spack-bash {0}
        run: |
          echo SPACK_ROOT: $SPACK_ROOT

The rest of the setup is clearly being executed, and if I really have to I can derive $SPACK_ROOT from $(which spack). Would it make sense to add it to $GITHUB_ENV`?

[AlexanderRichert-NOAA]

@sethrj @haampie

[sethrj]

Weird. It does look like it's sourcing the spack shell, and the spack shell exports SPACK_ROOT, so I have no clue why it's not showing up.

[haampie]

There's also spack_path. Is SPACK_ROOT ever needed? I've never used it.

[AlexanderRichert-NOAA]

It would be helpful at least for me since I use it in a setup script for my Spack extension (. $SPACK_ROOT/share/spack/setup-env.sh). But I can also derive it from spack location --spack-root so it's not critical.