Thanks @dscho for contributing #1369 . We have started using it and noticed the following issue

repo-a / .github/workflows/workflow-a.yml

jobs:
  job-1:
    runs-on: internal-runner

- uses: actions/checkout@v3
  with:
    sparse-checkout: |
      .github
      src

running just the above works as expected. But consider another workflow in the same repo

repo-a / .github/workflows/workflow-b.yml

jobs:
  job-12:
    runs-on: internal-runner

- uses: actions/checkout@v3
- run: ls ./not-src

When running workflow-a, then workflow workflow-b, workflow-b will not find any files in ./not-src.

This is because workflow workflow-b runs in the same _work directory as workflow-a. On the first run of workflow-a, we have polluted the repo in a way this action doesn't know about (and thus can't clean up).

Notice that, even in workflow-b:

git config --list will show core.sparseCheckout true
git sparse-checkout list will still include the listed paths
and a simple
ls will only show the sparse directories for workflow-a

It seems that - similar to the auth cleanup (and other pre-run steps) this action does - we need to disable sparse checkout in the pre steps of this action

Note: this is likely only an issue for self-hosted runners which dont get the same cleaning/re-init process github-hosted runners get

Similar-ish issue to recently reported 47fbe2d (for submodules, instead of sparse checkout). @megamanics