checking to see if diffFile is a submodule.

Is there a way to check to see if a diffFile is a submodule?

The repo that I'm getting my diff deltas from is bare so there's no working directory for Repository.lookup_submodule(path) or Repository.listall_submodules() to work with.

The main issue is when I try to get an added file via something like:

new_file = git_repo[delta.new_file.id]

I get the following key error.

Traceback (most recent call last):
  File "/Users/user/project/venv/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/Users/user/project/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/user/project/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/user/project/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/user/project/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "/Users/user/project/repos/views.py", line 105, in get
    new_file = git_repo[delta.new_file.id]
  File "/Users/user/project/venv/lib/python3.7/site-packages/pygit2/repository.py", line 121, in __getitem__
    raise KeyError(key)
KeyError: ffeef8955335d0ec95f23c2fd75821672cf14bb9

If it's a submodule I don't need the contents. I just need to know that it's a submodule. Is there a general way to do this?

まず、delta.new_file.id の周辺の処理と、Repository.lookup_submodule(path) および Repository.listall_submodules() API を、特に bare repositories について読みます。内容を読み込まずに diff エントリがサブモジュールを識別する方法を確認します。リポジトリをインデックス化する前にサブモジュールのエントリを区別する信頼できる方法が文書化または公開されれば完了です。