MDL-64310 backup: allow session to be released during backup/restore

Amended to fix a wrong call to backup_controller() constructor,
originally not passing USER->id

backup/controller/base_controller.class.php

@@ -33,6 +33,9 @@ abstract class base_controller extends backup implements loggable {
      */
     protected $logger;
 
+    /** @var bool Whether this backup should release the session. */
+    protected $releasesession = backup::RELEASESESSION_NO;
+
     /**
      * Gets the progress reporter, which can be used to report progress within
      * the backup or restore process.
@@ -82,4 +85,14 @@ abstract class base_controller extends backup implements loggable {
     public function log($message, $level, $a = null, $depth = null, $display = false) {
         backup_helper::log($message, $level, $a, $depth, $display, $this->logger);
     }
+
+    /**
+     * Returns the set value of releasesession.
+     * This is used to indicate if the session should be closed during the backup/restore.
+     *
+     * @return bool Indicates whether the session should be released.
+     */
+    public function get_releasesession() {
+        return $this->releasesession;
+    }
 }