[BUG]: Checkout with repo.clean deletes source folder if repository contains a file with name HEAD

[UniQP]

What happened?

The following pipeline deletes the source folder during the checkout step if the repository contains a file named HEAD that is checked out by the previous pipeline run. Instead, it should just clean the git repository.

jobs:
- job: Bug
  workspace:
    clean: all
  steps:
  - checkout: self

This happens because git reset --hard HEAD doesn't know whether HEAD refers to the current commit or the HEAD file. This can be fixed by either using git reset --hard (recommended) or git reset --hard HEAD -- instead.

Versions

Agent version 4.258.1 / Windows 10

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

No response

Version controll system

No response

Relevant log output

git version
git version 2.50.1.windows.1

git clean -ffdx
git reset --hard HEAD
fatal: ambiguous argument 'HEAD': both revision and filename
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
##[warning]Unable to run "git clean -ffdx" and "git reset --hard HEAD" successfully, delete source folder instead.