Finding alternate object directories on open

Git 2.11 introduced a change such that incoming objects in a push are sequestered in an "alternate object directory." It appears that libgit2 supports opening repositories with these directories, taking certain environment variables into consideration, but the latest pygit2 does not invoke the appropriate function (git_repository_open_ext() from what I can tell). Am I correct in this assessment? Is there a way to work around this with the current code, or is a patch necessary?

If that didn't make sense, let me explain at a higher level: I'm writing a receive hook in Python and using pygit2 to examine the incoming commits. With versions of Git prior to 2.11 this is not a problem since the incoming objects are stored directly in the odb. However, now they are located elsewhere and pygit2 does not see them.

首先跟踪 pygit2 打开仓库的方式，并将该路径与 libgit2 的 git_repository_open_ext() 进行比较，包括 issue 中描述的环境变量。验证传入对象位于备用对象目录中的 receive-hook 情况；当 pygit2 可以检查这些提交时即表示完成。