From f1272bbecd703e9c6f7ae7eb0435cb89d440e2c3 Mon Sep 17 00:00:00 2001
From: Frederic Massart <fred@moodle.com>
Date: Tue, 9 Sep 2014 10:21:16 +0800
Subject: [PATCH] MDL-46696 backup: Handle older backups not containing grade
 history

---
 backup/moodle2/restore_stepslib.php | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/backup/moodle2/restore_stepslib.php b/backup/moodle2/restore_stepslib.php
index e6251150c4c..1f8ec9e9447 100644
--- a/backup/moodle2/restore_stepslib.php
+++ b/backup/moodle2/restore_stepslib.php
@@ -3035,6 +3035,18 @@ class restore_activity_grades_structure_step extends restore_structure_step {
  */
 class restore_activity_grade_history_structure_step extends restore_structure_step {
 
+    /**
+     * This step is executed only if the grade history file is present.
+     */
+     protected function execute_condition() {
+        $fullpath = $this->task->get_taskbasepath();
+        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
+        if (!file_exists($fullpath)) {
+            return false;
+        }
+        return true;
+    }
+
     protected function define_structure() {
         $paths = array();