https://git.ruby-lang.org/ruby.git/commit/?id=d231b8f95b

From d231b8f95b35d8a344cec4f62d7bbdf360a70e1c Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Mon, 22 Jun 2020 17:07:49 +0900
Subject: Fix remove_entry error when path encoding is not compatible UTF-8


diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index 438f321..371a348 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -1287,7 +1287,11 @@ module FileUtils https://github.com/ruby/ruby/blob/trunk/lib/fileutils.rb#L1287
 
     def entries
       opts = {}
-      opts[:encoding] = fu_windows? ? ::Encoding::UTF_8 : path.encoding
+      if fu_windows? && ::Encoding.compatible?(::Encoding::UTF_8, path.encoding)
+        opts[:encoding] = ::Encoding::UTF_8
+      else
+        opts[:encoding] = path.encoding
+      end
 
       files = if Dir.respond_to?(:children)
         Dir.children(path, **opts)
diff --git a/test/fileutils/test_fileutils.rb b/test/fileutils/test_fileutils.rb
index a72cb6bc..8a546cc 100644
--- a/test/fileutils/test_fileutils.rb
+++ b/test/fileutils/test_fileutils.rb
@@ -756,6 +756,23 @@ class TestFileUtils < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/fileutils/test_fileutils.rb#L756
     assert_file_not_exist dir
   end
 
+  def test_remove_entry_multibyte_path
+    c = "\u00a7"
+    begin
+      c = c.encode('filesystem')
+    rescue EncodingError
+      c = c.b
+    end
+    dir = "tmpdir#{c}"
+    my_rm_rf dir
+
+    Dir.mkdir dir
+    File.write("#{dir}/#{c}.txt", "test_remove_entry_multibyte_path")
+
+    remove_entry dir
+    assert_file_not_exist dir
+  end
+
   def test_remove_entry_secure
     check_singleton :remove_entry_secure
 
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