From f6d27151356a05de5a736a06427d8c884a30765e Mon Sep 17 00:00:00 2001
From: Benoit Daloze <benoit.daloze@oracle.com>
Date: Wed, 9 Nov 2022 16:34:28 +0100
Subject: [PATCH] Skip the bash prelude in default bin/ scripts for the
 overwrite check in RubyGems

* Fixes https://github.com/oracle/truffleruby/issues/2780
---
 lib/mri/rubygems/installer.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/mri/rubygems/installer.rb b/lib/mri/rubygems/installer.rb
index 4cda09f200be..5d82ce1b0baf 100644
--- a/lib/mri/rubygems/installer.rb
+++ b/lib/mri/rubygems/installer.rb
@@ -223,7 +223,8 @@ def check_executable_overwrite(filename) # :nodoc:
       line = io.gets
       shebang = /^#!.*ruby/
 
-      if load_relative_enabled?
+      # TruffleRuby uses a bash prelude in default launchers
+      if load_relative_enabled? or defined?(::TruffleRuby)
         until line.nil? || line =~ shebang do
           line = io.gets
         end