From 5fd12c42e7911fe5a07db3f92167983bd6e78008 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADt=20Ondruch?= <vondruch@redhat.com>
Date: Fri, 3 Nov 2023 17:03:09 +0100
Subject: [PATCH] Cache `Gem.default_dir`

RubyGems do internally the same \[[1]\]. This should help with:

1) Performance (not tested)
2) Running RubyGems test suite (main motivation), which actually
   overrides the `@default_dir` \[[2]\] to be able to place test content
   into dedicated directory.

[1]: https://github.com/rubygems/rubygems/blob/f8e87eba76526d2609d543eb7774711d345edc61/lib/rubygems/defaults.rb#L38
[2]: https://github.com/rubygems/rubygems/blob/f8e87eba76526d2609d543eb7774711d345edc61/test/rubygems/helper.rb#L372
---
 operating_system.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/operating_system.rb b/operating_system.rb
index d95b303..f38aa5d 100644
--- a/operating_system.rb
+++ b/operating_system.rb
@@ -113,7 +113,7 @@ module Gem
     # RubyGems default overrides.
 
     def default_dir
-      Gem.default_dirs[:system][:gem_dir]
+      @default_dir ||= Gem.default_dirs[:system][:gem_dir]
     end
 
     def default_path