git: get effective GIT_DIR, if current dir is a working tree subdir and $GIT_DIR is unset

From a script, how to determine the current GIT_DIR? If not overriden, it's just the top level dir or the top level dir of a bare repo.

I want something like:

[/git/repo1/subdir]$ git show-git-dir
/git/repo1/.git

git

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