1 files changed, 8 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/core_ext/file/atomic.rb b/activesupport/lib/active_support/core_ext/file/atomic.rb
index fc3277f4d2..99c9435275 100644
--- a/activesupport/lib/active_support/core_ext/file/atomic.rb
+++ b/activesupport/lib/active_support/core_ext/file/atomic.rb
@@ -26,8 +26,14 @@ class File
       old_stat = stat(file_name)
     rescue Errno::ENOENT
       # No old permissions, write a temp file to determine the defaults
-      check_name = join(dirname(file_name), ".permissions_check.#{Thread.current.object_id}.#{Process.pid}.#{rand(1000000)}")
-      open(check_name, "w") { }
+      temp_file_name = [
+        '.permissions_check',
+        Thread.current.object_id,
+        Process.pid,
+        rand(1000000)
+      ].join('.')
+      check_name = join(dirname(file_name), temp_file_name)
+      open(check_name, 'w') { }
       old_stat = stat(check_name)
       unlink(check_name)
     end