Is there an existing issue for this?

• I have searched the existing issues

Are you using the latest Super-linter version available?

• I am using the latest Super-linter version.

• I can reproduce the issue running Super-linter using complete version identifier (example: vX.Y.Z), and not just with a partial one (example: vX)

• I am using the super-linter/super-linter action or container image, and not the deprecated github/super-linter action or container image.

Are you resonably sure that it's a Super-linter issue, and not an issue related to a tool that Super-linter runs?

• I think that this is a Super-linter issue.

Current Behavior

This seems similar to #7084 but not quite the same. So not sure if the fix (#7098) fixed this.
Also seems to be the same issue mentioned here #6873 (comment) by @dogmatic69

I have this set up:

      uses: super-linter/super-linter/[email protected]
      env:
        DEFAULT_BRANCH: main
        FILTER_REGEX_INCLUDE: src/static/html/.*
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        VALIDATE_HTML: true
        USE_FIND_ALGORITHM: true

It fails since 8.2.0 with the following:

  2025-10-08 15:05:54 [INFO]   Gathering GitHub information...
  2025-10-08 15:05:54 [INFO]   Successfully found GITHUB_EVENT_PATH: /github/workflow/event.json]
  2025-10-08 15:05:54 [INFO]   Successfully found GITHUB_SHA: 50a68fdd504fc3f93a9f235a3ae9b70af566c5d3
  fatal: ambiguous argument 'main': unknown revision or path not in the working tree.
  Use '--' to separate paths from revisions, like this:
  'git <command> [<revision>...] -- [<file>...]'
  Error: -08 15:05:54 [ERROR]   Failed to initialize GITHUB_BEFORE_SHA for a pull_request event. Output: main
  2025-10-08 15:05:54 [FATAL]   Error while initializing GITHUB_BEFORE_SHA

Expected Behavior

The config works. Or the 8.2.0 release notes warn of changes needed.

Super-Linter version

v8.2.0

Super-linter configuration

- name: Checkout branch
      uses: actions/checkout@v5
      with:
        # Full git history is needed to get a proper list of changed files within `super-linter`
        fetch-depth: 0

    #Some other steps not shown to generate the HTML we want to lint

    - name: Lint Generated HTML
      uses: super-linter/super-linter/[email protected]
      env:
        DEFAULT_BRANCH: main
        FILTER_REGEX_INCLUDE: src/static/html/.*
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        VALIDATE_HTML: true
        USE_FIND_ALGORITHM: true

Relevant log output

2025-10-08 15:05:54 [INFO]   Gathering GitHub information...
  2025-10-08 15:05:54 [INFO]   Successfully found GITHUB_EVENT_PATH: /github/workflow/event.json]
  2025-10-08 15:05:54 [INFO]   Successfully found GITHUB_SHA: 50a68fdd504fc3f93a9f235a3ae9b70af566c5d3
  fatal: ambiguous argument 'main': unknown revision or path not in the working tree.
  Use '--' to separate paths from revisions, like this:
  'git <command> [<revision>...] -- [<file>...]'
  Error: -08 15:05:54 [ERROR]   Failed to initialize GITHUB_BEFORE_SHA for a pull_request event. Output: main
  2025-10-08 15:05:54 [FATAL]   Error while initializing GITHUB_BEFORE_SHA

Steps To Reproduce

All PRs with above config seem to fail. Works fine if pinned to 8.1.0

Anything else?

No response