Bug report between git hooks and git worktree

[Preston Tunnell Wilson <prestontunnellwilson@gmail.com>]

Hello!

I ran into a strange issue using git-worktree with git-hooks. I have
attached the output of `git bugreport` below. More concrete steps to
reproduce are available in
https://github.com/prestontw/git_hook-git_worktree-minimal-repo. I've
run into this both in macOS and Fedora---I've included the system
information from both of these systems below.

What did you do before the bug happened? (Steps to reproduce your issue)

Add a git hook that executes git commands inside of another folder. Let's
call this other folder `FolderA`.
(This might sound weird, but `flutter` distributes itself through a `git`
folder in some circumstances and uses `git` commands to see which version
the user has installed, etc.).

Add a git worktree branch/folder, `cd` to it, and commit something there.
Let's call this git worktree folder `FolderW`.

(Steps are outlined in more detail with an example in
https://github.com/prestontw/git_hook-git_worktree-minimal-repo.)

What did you expect to happen? (Expected behavior)

The git command would report details from `FolderA`.

What happened instead? (Actual behavior)

The git command outputs details from `FolderW`.

What's different between what you expected and what actually happened?

I would expect the git command to output details from `FolderA`.
It's confusing to me that there is a difference in behavior between
the "main" branch and `FolderW` in git hooks.

Anything else you want to add:

I'm seeing this both in macOS and Fedora. I've added that system
info below.


[System Info]
git version:
git version 2.32.0 (Apple Git-132)
cpu: arm64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
uname: Darwin 21.4.0 Darwin Kernel Version 21.4.0: Mon Feb 21 20:35:58
PST 2022; root:xnu-8020.101.4~2/RELEASE_ARM64_T6000 arm64
compiler info: clang: 13.1.6 (clang-1316.0.21.2)
libc info: no libc information available
$SHELL (typically, interactive shell): /bin/zsh


[Enabled Hooks]
pre-commit


[System Info]
git version:
git version 2.37.3
cpu: aarch64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
uname: Linux 6.0.7-301.fc37.aarch64 #1 SMP PREEMPT_DYNAMIC Fri Nov 4 18:13:35 U>
compiler info: gnuc: 12.2
libc info: glibc: 2.36
$SHELL (typically, interactive shell): /bin/bash


[Enabled Hooks]
pre-commit