https://git.ruby-lang.org/ruby.git/commit/?id=a16de43f23

From a16de43f23c0ca160ee3bf3c8655a6ebb586e8fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Wed, 22 Jun 2022 14:24:19 +0200
Subject: [rubygems/rubygems] Add `gem env user_gemhome` and `gem env
 user_gemdir`

https://github.com/rubygems/rubygems/commit/14d3f80df6
---
 lib/rubygems/commands/environment_command.rb       |  3 +++
 .../test_gem_commands_environment_command.rb       | 22 ++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/lib/rubygems/commands/environment_command.rb b/lib/rubygems/commands/environment_command.rb
index ceccf882ee..b6b3d3812c 100644
--- a/lib/rubygems/commands/environment_command.rb
+++ b/lib/rubygems/commands/environment_command.rb
@@ -10,6 +10,7 @@ class Gem::Commands::EnvironmentCommand < Gem::Command https://github.com/ruby/ruby/blob/trunk/lib/rubygems/commands/environment_command.rb#L10
     args = <<-EOF
           home            display the path where gems are installed. Aliases: gemhome, gemdir, GEM_HOME
           path            display path used to search for gems. Aliases: gempath, GEM_PATH
+          user_gemhome    display the path where gems are installed when `--user-install` is given. Aliases: user_gemdir
           version         display the gem format version
           remotesources   display the remote gem servers
           platform        display the supported gem platforms
@@ -80,6 +81,8 @@ lib/rubygems/defaults/operating_system.rb https://github.com/ruby/ruby/blob/trunk/lib/rubygems/commands/environment_command.rb#L81
         Gem.dir
       when /^gempath/, /^path/, /^GEM_PATH/ then
         Gem.path.join(File::PATH_SEPARATOR)
+      when /^user_gemdir/, /^user_gemhome/ then
+        Gem.user_dir
       when /^remotesources/ then
         Gem.sources.to_a.join("\n")
       when /^platform/ then
diff --git a/test/rubygems/test_gem_commands_environment_command.rb b/test/rubygems/test_gem_commands_environment_command.rb
index 23aa11990b..eeddb2befe 100644
--- a/test/rubygems/test_gem_commands_environment_command.rb
+++ b/test/rubygems/test_gem_commands_environment_command.rb
@@ -65,6 +65,28 @@ class TestGemCommandsEnvironmentCommand < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_commands_environment_command.rb#L65
     assert_equal '', @ui.error
   end
 
+  def test_execute_user_gemdir
+    @cmd.send :handle_options, %w[user_gemdir]
+
+    use_ui @ui do
+      @cmd.execute
+    end
+
+    assert_equal "#{Gem.user_dir}\n", @ui.output
+    assert_equal '', @ui.error
+  end
+
+  def test_execute_user_gemhome
+    @cmd.send :handle_options, %w[user_gemhome]
+
+    use_ui @ui do
+      @cmd.execute
+    end
+
+    assert_equal "#{Gem.user_dir}\n", @ui.output
+    assert_equal '', @ui.error
+  end
+
   def test_execute_gempath
     @cmd.send :handle_options, %w[gempath]
 
-- 
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