patchSet fails when localRoot contains subdirectory

[ndhaller]

When a Combination Source uses a localRoot with a sub-directory name, and that Source uses a patchSet, the dynamic branch JSON file is attempted to be created in the wrong directory location and errors out.

Example:

  <PatchSets>
    <PatchSet remote="Edk2PlatformsRepo" name="edk2platforms_test" parentSha="84ccada59257a8151a592a416017fbb03b8ed3cf" fetchBranch="master">
      <Revert sha="84ccada59257a8151a592a416017fbb03b8ed3cf" />
    </PatchSet> 
  </PatchSets>


  <CombinationList>
    <Combination name="sandbox-subDirectory-patchSet-test" description="combo will fail">
      <Source localRoot="test/edk2-platforms" remote="Edk2PlatformsRepo" patchSet="edk2platforms_test" sparseCheckout="true" />
    </Combination>
    <Combination name="sandbox-main" description="combo will succeed">
      <Source localRoot="test/edk2-platforms" remote="Edk2PlatformsRepo" branch="master" sparseCheckout="true" />
    </Combination>
  </CombinationList>

Attempting to checkout "sandbox-subDirectory-patchSet-test" combination will crash after the dynamic branch has been created.

edkrepo checkout sandbox-subDirectory-patchSet-test -v

Traceback (most recent call last):
  File "C:\Python39\lib\site-packages\edkrepo\edkrepo_cli.py", line 183, in main
    command.run_command(command_name, parsed_args, config)
  File "C:\Python39\lib\site-packages\edkrepo\commands\composite_command.py", line 38, in run_command
    return command.run_command(args, config)
  File "C:\Python39\lib\site-packages\edkrepo\commands\checkout_command.py", line 45, in run_command
    checkout(args.Combination, global_manifest_path, args.verbose, args.override, get_repo_cache_obj(config))
  File "C:\Python39\lib\site-packages\edkrepo\common\common_repo_functions.py", line 621, in checkout
    checkout_repos(verbose, override, repo_sources, workspace_path, manifest, global_manifest_path)
  File "C:\Python39\lib\site-packages\edkrepo\common\common_repo_functions.py", line 367, in checkout_repos
    patchset_branch_creation_flow(repo_to_checkout, repo, workspace_path, manifest, global_manifest_path, override)
  File "C:\Python39\lib\site-packages\edkrepo\common\common_repo_functions.py", line 422, in patchset_branch_creation_flow
    create_local_branch(repo.patch_set, patchset, global_manifest_path, manifest, repo_obj)
  File "C:\Python39\lib\site-packages\edkrepo\common\common_repo_functions.py", line 885, in create_local_branch
    with open(json_path, 'w') as f:
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\git3\\Edkrepo_Sandbox\\test\\repo\\patchset_edk2-platforms.json'
Error: [Errno 2] No such file or directory: 'C:\\git3\\Edkrepo_Sandbox\\test\\repo\\patchset_edk2-platforms.json'

Edkrepo_Sandbox\repo\patchset_edk2-platforms.json should have been created.
Instead, "Edkrepo_Sandbox\test\repo\patchset_edk2-platforms.json" is attempted to be created, and fails.

Reproduced with edkrepo 3.1.1, python 3.9.13, and git version 2.39.1.windows.1 , on Windows 11 Enterprise