Merge pull request #4452 from tapajos/e5425c8f

Fix cache (FileStore) clear to keep .gitkeep.

activesupport/lib/active_support/cache/file_store.rb

@@ -23,7 +23,7 @@ def initialize(cache_path, options = nil)
       end
 
       def clear(options = nil)
-        root_dirs = Dir.entries(cache_path).reject{|f| f.in?(EXCLUDED_DIRS)}
+        root_dirs = Dir.entries(cache_path).reject{|f| f.in?(EXCLUDED_DIRS + [".gitkeep"])}
         FileUtils.rm_r(root_dirs.collect{|f| File.join(cache_path, f)})
       end
 

activesupport/test/caching_test.rb

@@ -568,6 +568,13 @@ def cache_dir
   include CacheDeleteMatchedBehavior
   include CacheIncrementDecrementBehavior
 
+  def test_clear
+    filepath = File.join(cache_dir, ".gitkeep")
+    FileUtils.touch(filepath)
+    @cache.clear
+    assert File.exist?(filepath)
+  end
+
   def test_key_transformation
     key = @cache.send(:key_file_path, "views/index?id=1")
     assert_equal "views/index?id=1", @cache.send(:file_path_key, key)