atomic write race condition

activesupport/CHANGELOG.md

@@ -1,3 +1,5 @@
+*   Improve `File.atomic_write` error handling
+
 *   Fix `Class#descendants` and `DescendantsTracker#descendants` compatibility with Ruby 3.1.
 
     [The native `Class#descendants` was reverted prior to Ruby 3.1 release](https://bugs.ruby-lang.org/issues/14394#note-33),

activesupport/lib/active_support/core_ext/file/atomic.rb

@@ -64,6 +64,8 @@ class File
     file_name = join(dir, basename)
     FileUtils.touch(file_name)
     stat(file_name)
+  rescue Errno::ENOENT
+    file_name = nil
   ensure
     FileUtils.rm_f(file_name) if file_name
   end

activesupport/test/core_ext/file_test.rb

@@ -83,6 +83,10 @@ class AtomicWriteTest < ActiveSupport::TestCase
     File.unlink(file_name) rescue nil
   end
 
+  def test_probe_stat_in_when_no_dir
+    assert_nil File.probe_stat_in("/dir/does/not/exist")
+  end
+
   private
     def file_name
       "atomic-#{Process.pid}.file"