medium_save_derived_data.yml

save_derived_data:
  steps:
    # This will create file with current commit SHA from develop branch
    # We need to store it to file just to be able to use it as a key inside `save_cache` command.
    # Because it is not possible to directly embed it inside {{ }}
    - run:
        name: Add current develop commit SHA environment variable
        command: |
          echo $(git show --format="%H" --no-patch) > /tmp/current_dev_commit_sha

    # tar up the derived data in the appropriate format that we used for untarring above.
    - run:
        name: Tar up derived data
        command: mkdir -p dd-tar-cache && tar cfPp dd-tar-cache/dd.tar --format posix ~/Library/Developer/Xcode/DerivedData/

    - save_cache:
        name: "Save cache [Derived Data]"
        key: v1-derived-data-cache-{{ checksum "/tmp/current_dev_commit_sha" }}
        paths:
          - dd-tar-cache