Merge pull request #9329 from chuckbjones/fix-cache-delete-rc

Fix deletion of empty directories

3 files changed, 16 insertions, 2 deletions

diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index e76af6adc4..c280a782c0 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -3,6 +3,8 @@
 
 ## Rails 4.0.0.beta1 (February 25, 2013) ##
 
+*   Fix deletion of empty directories in ActiveSupport::Cache::FileStore. *Charles Jones*
+
 *   Prevent `DateTime#change` from truncating the second fraction, when seconds
     do not need to be changed.
 
diff --git a/activesupport/lib/active_support/cache/file_store.rb b/activesupport/lib/active_support/cache/file_store.rb
index 8e265ad863..0c55aa8a32 100644
--- a/activesupport/lib/active_support/cache/file_store.rb
+++ b/activesupport/lib/active_support/cache/file_store.rb
@@ -150,9 +150,9 @@ module ActiveSupport
 
         # Delete empty directories in the cache.
         def delete_empty_directories(dir)
-          return if dir == cache_path
+          return if File.realpath(dir) == File.realpath(cache_path)
           if Dir.entries(dir).reject {|f| EXCLUDED_DIRS.include?(f)}.empty?
-            File.delete(dir) rescue nil
+            Dir.delete(dir) rescue nil
             delete_empty_directories(File.dirname(dir))
           end
         end
diff --git a/activesupport/test/caching_test.rb b/activesupport/test/caching_test.rb
index 5158bbc196..ede08e23d5 100644
--- a/activesupport/test/caching_test.rb
+++ b/activesupport/test/caching_test.rb
@@ -672,6 +672,18 @@ class FileStoreTest < ActiveSupport::TestCase
     end
   end
 
+  def test_delete_does_not_delete_empty_parent_dir
+    sub_cache_dir = File.join(cache_dir, 'subdir/')
+    sub_cache_store = ActiveSupport::Cache::FileStore.new(sub_cache_dir)
+    assert_nothing_raised(Exception) do
+      assert sub_cache_store.write('foo', 'bar')
+      assert sub_cache_store.delete('foo')
+    end
+    assert File.exist?(cache_dir), "Parent of top level cache dir was deleted!"
+    assert File.exist?(sub_cache_dir), "Top level cache dir was deleted!"
+    assert Dir.entries(sub_cache_dir).reject {|f| ActiveSupport::Cache::FileStore::EXCLUDED_DIRS.include?(f)}.empty?
+  end
+
   def test_log_exception_when_cache_read_fails
     File.expects(:exist?).raises(StandardError, "failed")
     @cache.send(:read_entry, "winston", {})