[bug] Orb doesn't perform code checkout

[atmosx]

Orb version:

v0.0.2

What happened:

I'm using the orb v0.0.2 to perform path filtering as follows:

workflows:
  gameserver-config:
    jobs:
      - path-filtering/filter:
          config-path: .circleci/modules/gameserver.yml
          base-revision: staging
          mapping: |
            modules/code-game-.*
          filters:
            branches:
              only:
                - panagiotis/eng-1162-circleci-introduce-path-base-builds

Error I'm getting in CircleCI:

Traceback (most recent call last):
  File "<string>", line 10, in <module>
  File "/home/circleci/.pyenv/versions/3.8.10/lib/python3.8/subprocess.py", line 516, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['git', 'merge-base', 'staging', 'd1f1cea2030d424011509e9bc5ebca39626134ab']' returned non-zero exit status 128.

Expected behavior:

Perform path filtering

Additional Information:

The problem is that there's no source code in the directory. The strange thing is that adding - checkout step doesn't solve this. I've also seen that the orb performs checkout anyway.

I'm probably doing something wrong, any ideas?

[atmosx]

Not sure which one was the fix:

• I was missing the setup: true keyword in the YAML
• Had to use the origin keyword pointing to a branch: base-revision: origin/staging