From 8a0a88705676d1ad03b8ce8874e81befda5a4c0c Mon Sep 17 00:00:00 2001
From: Adrian Ho <the.gromgit@gmail.com>
Date: Sun, 20 Jul 2025 10:24:08 +0800
Subject: [PATCH] env_script_all_files: don't overwrite existing stuff

Overwriting upstream content potentially causes major confusion at best, major breakage at worst.
---
 Library/Homebrew/extend/pathname.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 111a464804..f65ac07a07 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -340,8 +340,10 @@ class Pathname
     Pathname.glob("#{self}/*") do |file|
       next if file.directory?
 
-      dst.install(file)
       new_file = dst.join(file.basename)
+      raise Errno::EEXIST, new_file if new_file.exist?
+
+      dst.install(file)
       file.write_env_script(new_file, env)
     end
   end