From bbfd735b887de71de48c7f862e6e3842bcc03241 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Thu, 5 Jan 2023 14:52:13 +0100
Subject: [PATCH] [rubygems/rubygems] TruffleRuby uses a bash prelude in
 default launchers

https://github.com/rubygems/rubygems/commit/e119f4208a
---
 lib/rubygems/installer.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index b5644c36b7..1e35e4fe83 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -226,7 +226,8 @@ class Gem::Installer
       line = io.gets
       shebang = /^#!.*ruby/
 
-      if load_relative_enabled?
+      # TruffleRuby uses a bash prelude in default launchers
+      if load_relative_enabled? || RUBY_ENGINE == "truffleruby"
         until line.nil? || line =~ shebang do
           line = io.gets
         end