[BUG]: Does not support custom git config path via GIT_CONFIG_GLOBAL

[utilyre]

Describe the bug
I tried to commit some changes and got the following error

commit error:
git error:config value 'user.name' was not found; class=Config (7); code=NotFound (-3)

It turns out it cannot find user.name or any other config because I have my git configuration in a different path from ~/.gitconfig, which I achieved by setting GIT_CONFIG_GLOBAL to ~/.config/git/config.ini.

To Reproduce
Steps to reproduce the behavior:

1. export GIT_CONFIG_GLOBAL=~/.config/git/config.ini (or any other location)
2. Go to a git repository and make some changes
3. Commit through gitui
4. See error

Expected behavior
It should check for this environment variable and use it if set.
Also there is another environment variable that is related: GIT_CONFIG_SYSTEM.

Workaround

ln -s $GIT_CONFIG_GLOBAL ~/.gitconfig

Context (please complete the following information):

• OS/Distro + Version: Fedora Linux 40
• GitUI Version: gitui 0.26.3 2024-06-02 ()
• Rust version: NA (installed through dnf)

[extrawurst]

That is interesting. upstream supports this since last year: libgit2/libgit2#6544

[extrawurst]

@utilyre if you have any chance to build from #2299 it would be great to test if this fixes your problem

[koffydrop]

@extrawurst i was having the same problem and the build from #2299 did fix it

[extrawurst]

#2299 is merged now and a new nightly build triggered