From cde9dec39688248da8aa4e99919ddd66a7f7a63f Mon Sep 17 00:00:00 2001
From: Hiroshi Shimoju <hiroshi.shimoju@gmail.com>
Date: Tue, 3 Feb 2015 13:54:47 +0900
Subject: [PATCH] Check that WP_CONTENT_DIR and advanced-cache.php are writable

---
 wp-ffpc-class.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/wp-ffpc-class.php b/wp-ffpc-class.php
index d1c0bb2..ff5e33c 100644
--- a/wp-ffpc-class.php
+++ b/wp-ffpc-class.php
@@ -975,6 +975,14 @@ class WP_FFPC extends PluginAbstract {
 	 */
 	private function deploy_advanced_cache( ) {
 
+		/* check that WP_CONTENT_DIR is writable */
+		if ( ! @is_writable( WP_CONTENT_DIR ))
+			return false;
+
+		/* check that advanced-cache.php is writable if advanced-cache.php exists */
+		if ( @file_exists( $this->acache ) && ! @is_writable( $this->acache ))
+			return false;
+
 		/* if no active site left no need for advanced cache :( */
 		if ( empty ( $this->global_config ) ) {
 			unlink ( $this->acache );