From a7c1c0e73272d9c13e1de1b3d94e8f8c23a0ae2d Mon Sep 17 00:00:00 2001
From: Vaclav Elias <vaclavelias@gmail.com>
Date: Fri, 28 Aug 2015 08:39:33 +0100
Subject: [PATCH] Check if the exec function exists.

On the CentOS 7 server, it simply didn't go through this. After this check it moved to the other compression method and the backup was successfull.
---
 wp-db-backup.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-db-backup.php b/wp-db-backup.php
index 2899e3b..c6ef619 100755
--- a/wp-db-backup.php
+++ b/wp-db-backup.php
@@ -1047,7 +1047,7 @@ function deliver_backup($filename = '', $delivery = 'http', $recipient = '', $lo
 			/**
 			 * Try gzipping with an external application
 			 */
-			if ( file_exists( $diskfile ) && ! file_exists( $gz_diskfile ) ) {
+			if (function_exists('exec') && file_exists( $diskfile ) && ! file_exists( $gz_diskfile ) ) {
 				@exec( "gzip $diskfile" );
 			}