From 82eaabf7fe852ea0304fb1bc9ca8454ef3cc52a2 Mon Sep 17 00:00:00 2001
From: Bo Anderson <mail@boanderson.me>
Date: Sat, 14 Jun 2025 01:54:12 +0100
Subject: [PATCH] api_hashable: retain access to global gitconfig

---
 Library/Homebrew/api_hashable.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Library/Homebrew/api_hashable.rb b/Library/Homebrew/api_hashable.rb
index e1e4098e95..c520d6ff65 100644
--- a/Library/Homebrew/api_hashable.rb
+++ b/Library/Homebrew/api_hashable.rb
@@ -10,9 +10,11 @@ module APIHashable
     @old_homebrew_prefix = HOMEBREW_PREFIX
     @old_homebrew_cellar = HOMEBREW_CELLAR
     @old_home = Dir.home
+    @old_git_config_global = ENV.fetch("GIT_CONFIG_GLOBAL", nil)
     Object.send(:remove_const, :HOMEBREW_PREFIX)
     Object.const_set(:HOMEBREW_PREFIX, Pathname.new(HOMEBREW_PREFIX_PLACEHOLDER))
     ENV["HOME"] = HOMEBREW_HOME_PLACEHOLDER
+    ENV["GIT_CONFIG_GLOBAL"] = File.join(@old_home, ".gitconfig")
 
     @generating_hash = true
   end
@@ -24,6 +26,7 @@ module APIHashable
     Object.send(:remove_const, :HOMEBREW_PREFIX)
     Object.const_set(:HOMEBREW_PREFIX, @old_homebrew_prefix)
     ENV["HOME"] = @old_home
+    ENV["GIT_CONFIG_GLOBAL"] = @old_git_config_global
 
     @generating_hash = false
   end