From c763be7c97973fa0dd296fd895d4704dcd4734b1 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@hawthorn.email>
Date: Mon, 3 Jun 2019 17:53:18 -0700
Subject: Don't call listen with empty directory list

Listen interprets an empty list of directories as "watch the current
directory". Since EventedFileUpdateChecker doesn't share these
semantics, we should not initialize listen if we end up with an empty
directory list.
---
 activesupport/lib/active_support/evented_file_update_checker.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'activesupport/lib/active_support')

diff --git a/activesupport/lib/active_support/evented_file_update_checker.rb b/activesupport/lib/active_support/evented_file_update_checker.rb
index 84caa00b58..5a79822c49 100644
--- a/activesupport/lib/active_support/evented_file_update_checker.rb
+++ b/activesupport/lib/active_support/evented_file_update_checker.rb
@@ -108,7 +108,10 @@ module ActiveSupport
     private
       def boot!
         normalize_dirs!
-        Listen.to(*@dtw, &method(:changed)).start
+
+        unless @dtw.empty?
+          Listen.to(*@dtw, &method(:changed)).start
+        end
       end
 
       def shutdown!
-- 
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