From 82960c262fea081cdd3df14ebe573ff1c4925d0c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@riseup.net>
Date: Fri, 6 Aug 2021 12:21:23 +0200
Subject: [PATCH] Also load user installed rubygems plugins

---
 lib/rubygems.rb           |  4 +++-
 test/rubygems/test_gem.rb | 25 +++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/lib/rubygems.rb b/lib/rubygems.rb
index a631cde8bf8..17881e2e0e9 100644
--- a/lib/rubygems.rb
+++ b/lib/rubygems.rb
@@ -1063,7 +1063,9 @@ def self.load_plugin_files(plugins) # :nodoc:
   # Find rubygems plugin files in the standard location and load them
 
   def self.load_plugins
-    load_plugin_files Gem::Util.glob_files_in_dir("*#{Gem.plugin_suffix_pattern}", plugindir)
+    Gem.path.each do |gem_path|
+      load_plugin_files Gem::Util.glob_files_in_dir("*#{Gem.plugin_suffix_pattern}", plugindir(gem_path))
+    end
   end
 
   ##
diff --git a/test/rubygems/test_gem.rb b/test/rubygems/test_gem.rb
index 0d4b1571ca7..da154dac75b 100644
--- a/test/rubygems/test_gem.rb
+++ b/test/rubygems/test_gem.rb
@@ -1581,6 +1581,31 @@ def test_load_plugins
     assert_equal %w[plugin], PLUGINS_LOADED
   end
 
+  def test_load_user_installed_plugins
+    plugin_path = File.join "lib", "rubygems_plugin.rb"
+
+    Dir.chdir @tempdir do
+      FileUtils.mkdir_p 'lib'
+      File.open plugin_path, "w" do |fp|
+        fp.puts "class TestGem; PLUGINS_LOADED << 'plugin'; end"
+      end
+
+      foo = util_spec 'foo', '1' do |s|
+        s.files << plugin_path
+      end
+
+      install_gem_user foo
+    end
+
+    Gem.paths = { "GEM_PATH" => [Gem.dir, Gem.user_dir].join(File::PATH_SEPARATOR) }
+
+    gem 'foo'
+
+    Gem.load_plugins
+
+    assert_equal %w[plugin], PLUGINS_LOADED
+  end
+
   def test_load_env_plugins
     with_plugin('load') { Gem.load_env_plugins }
     assert_equal :loaded, TEST_PLUGIN_LOAD rescue nil