From 5a8e87cb2ef7e4d6c0bdc86a4af207ecbb56a1e7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sat, 19 Jul 2025 23:04:54 +0900
Subject: [PATCH] [ruby/fileutils] Just the parent path of the destination
 symlink should exist

https://github.com/ruby/fileutils/commit/71225b1b46
---
 lib/fileutils.rb                 | 2 +-
 test/fileutils/test_fileutils.rb | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index 05d0dc83a7..775b277a72 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -739,7 +739,7 @@ module FileUtils
         real_ddirs = fu_split_path(File.realpath(parent))
       else
         destdirs ||= fu_split_path(dest)
-        real_ddirs ||= fu_split_path(File.realpath(dest))
+        real_ddirs ||= fu_split_path(File.realdirpath(dest))
       end
       srcdirs = fu_split_path(s)
       i = fu_common_components(srcdirs, destdirs)
diff --git a/test/fileutils/test_fileutils.rb b/test/fileutils/test_fileutils.rb
index 4ccea53e95..92308d9557 100644
--- a/test/fileutils/test_fileutils.rb
+++ b/test/fileutils/test_fileutils.rb
@@ -1080,7 +1080,11 @@ class TestFileUtils < Test::Unit::TestCase
       assert_raise(Errno::EEXIST, Errno::EACCES) {
         ln_sr fname, 'tmp', target_directory: false
       }
-      assert_file.not_exist? File.join('tmp/', File.basename(fname))
+      dest = File.join('tmp/', File.basename(fname))
+      assert_file.not_exist? dest
+      ln_sr fname, dest, target_directory: false
+      assert_file.symlink?(dest)
+      assert_equal("../#{fname}", File.readlink(dest))
     end
   end if have_symlink?