Re: git aliases and GIT_PREFIX

>Hi Federico,
>
>On Thu, 28 Oct 2021, Federico Kircheis wrote:
>
>> today I reported what I believed to be a bug on
>>
>>  https://github.com/git-for-windows/git/issues/3496
>>
>> and learned about GIT_DIR when working with aliases and git worktree.
>>
>> It's annoying that GIT_DIR it is defined only if (as far as I've understood)
>> working from a worktrees or submodule, as it does not seem to be related to
>> those type of repositories.
>
>To clarify: `GIT_DIR` is set when executing an alias in a worktree other
>than the primary one (and probably also in submodules), but not when
>executing in a primary worktree.
>
>> This is also irritating because apparently working aliases breaks when being
>> executed from those repositories.
>
>To clarify: an alias that wants to switch to a different repository and
>execute Git commands there works well in a primary worktree. But when you
>switch to a different repository while executing an alias from a secondary
>worktree, it will fail because of `GIT_DIR` having been set.
>
>> I believe it would be better if GIT_DIR it's either always set or never
>> (could someone enlighten me why the variable is needed in first place?).

>The fact that `GIT_DIR` is not set when calling an alias in a primary
>worktree suggests that the behavior in secondary worktrees is not by
>design. We should therefore be able to stop setting it there.
>
>The question is: what code is responsible for setting it only in some
>circumstances but not others?
>
>Federico, do you have any experience in debugging C code? If so, it would
>be good if you could take a crack at investigating this.
>
>Ciao,
>Johannes