Revert "Use Homebrew's gitconfig for various commands"

Library/Homebrew/cmd/log.rb

@@ -39,6 +39,6 @@ module Homebrew
     end
     args = ARGV.options_only
     args += ["--follow", "--", path] unless path.nil?
-    Utils.with_homebrew_gitconfig { exec "git", "log", *args }
+    exec "git", "log", *args
   end
 end

Library/Homebrew/cmd/update-reset.sh

@@ -28,8 +28,6 @@ EOS
     set -x
   fi
 
-  export HOME="$HOMEBREW_LIBRARY/Homebrew/gitconfig"
-
   for DIR in "$HOMEBREW_REPOSITORY" "$HOMEBREW_LIBRARY"/Taps/*/*
   do
     [[ -d "$DIR/.git" ]] || continue

Library/Homebrew/cmd/update.sh

@@ -19,11 +19,7 @@ git() {
   then
     GIT_EXECUTABLE="$("$HOMEBREW_LIBRARY/Homebrew/shims/scm/git" --homebrew=print-path)"
   fi
-  OLDHOME="$HOME"
-  export HOME="$HOMEBREW_LIBRARY/Homebrew/gitconfig"
   "$GIT_EXECUTABLE" "$@"
-  export HOME="$OLDHOME"
-  unset OLDHOME
 }
 
 git_init_if_necessary() {

Library/Homebrew/download_strategy.rb

@@ -793,19 +793,15 @@ class GitDownloadStrategy < VCSDownloadStrategy
   def update_repo
     return unless @ref_type == :branch || !ref?
 
-    Utils.with_homebrew_gitconfig do
+    if !shallow_clone? && shallow_dir?
-      if !shallow_clone? && shallow_dir?
+      quiet_safe_system "git", "fetch", "origin", "--unshallow"
-        quiet_safe_system "git", "fetch", "origin", "--unshallow"
+    else
-      else
+      quiet_safe_system "git", "fetch", "origin"
-        quiet_safe_system "git", "fetch", "origin"
-      end
     end
   end
 
   def clone_repo
-    Utils.with_homebrew_gitconfig do
+    safe_system "git", *clone_args
-      safe_system "git", *clone_args
-    end
     cached_location.cd do
       safe_system "git", "config", "homebrew.cacheversion", cache_version
       checkout
@@ -815,9 +811,7 @@ class GitDownloadStrategy < VCSDownloadStrategy
 
   def checkout
     ohai "Checking out #{@ref_type} #{@ref}" if @ref_type && @ref
-    Utils.with_homebrew_gitconfig do
+    quiet_safe_system "git", "checkout", "-f", @ref, "--"
-      quiet_safe_system "git", "checkout", "-f", @ref, "--"
-    end
   end
 
   def reset_args
@@ -836,10 +830,8 @@ class GitDownloadStrategy < VCSDownloadStrategy
   end
 
   def update_submodules
-    Utils.with_homebrew_gitconfig do
+    quiet_safe_system "git", "submodule", "foreach", "--recursive", "git submodule sync"
-      quiet_safe_system "git", "submodule", "foreach", "--recursive", "git submodule sync"
+    quiet_safe_system "git", "submodule", "update", "--init", "--recursive"
-      quiet_safe_system "git", "submodule", "update", "--init", "--recursive"
-    end
     fix_absolute_submodule_gitdir_references!
   end
 

Library/Homebrew/gitconfig/.gitconfig

@@ -1,14 +0,0 @@
-[user]
-	# Name used in commit messages.
-	name = Homebrew
-	# Email used in commit messages.
-	email = git@brew.sh
-[fetch]
-	# Always prune when fetching (and pulling).
-	prune = 1
-[core]
-	# Don't prompt for commit messages for merge commits.
-	mergeoptions = --no-edit
-[credential]
-	# Use macOS Keychain to store HTTP passwords.
-	helper = osxkeychain

Library/Homebrew/tap.rb

@@ -230,7 +230,7 @@ class Tap
       ohai "Unshallowing #{name}" unless quiet
       args = %w[fetch --unshallow]
       args << "-q" if quiet
-      Utils.with_homebrew_gitconfig { path.cd { safe_system "git", *args } }
+      path.cd { safe_system "git", *args }
       return
     end
 
@@ -242,7 +242,7 @@ class Tap
     args << "-q" if quiet
 
     begin
-      Utils.with_homebrew_gitconfig { safe_system "git", *args }
+      safe_system "git", *args
       unless Readall.valid_tap?(self, aliases: true)
         unless ARGV.homebrew_developer?
           raise "Cannot tap #{name}: invalid syntax in tap!"

Library/Homebrew/utils/git.rb

@@ -60,12 +60,6 @@ module Utils
     raise "Git is unavailable" unless git_available?
   end
 
-  def self.with_homebrew_gitconfig
-    with_env(HOME: HOMEBREW_LIBRARY/"Homebrew/gitconfig") do
-      yield if block_given?
-    end
-  end
-
   def self.clear_git_available_cache
     @git = nil
     @git_path = nil