Issue #1812338 by helmo: Refactor sync back.

platform/backup.provision.inc

@@ -59,12 +59,7 @@ function drush_provision_drupal_provision_backup() {
 
 
   // synch all filesystem changes back from the remote server.
-  d()->service('http')->fetch(d()->site_path . '/files/');
-  d()->service('http')->fetch(d()->site_path . '/private/');
-  d()->service('http')->fetch(d()->site_path . '/modules/');
-  d()->service('http')->fetch(d()->site_path . '/themes/');
-  d()->service('http')->fetch(d()->site_path . '/libraries/');
-  d()->service('http')->fetch(d()->site_path . '/local.settings.php');
+  provision_drupal_sync_site_back();
 
   // Check if we are currently cloaking credentials
   $cloaked = d()->service('http')->cloaked_db_creds();

platform/provision_drupal.drush.inc

@@ -107,6 +107,22 @@ function provision_drupal_sync_site() {
   }
 }
 
+/**
+ * Sync the current Drupal site BACK from a slave. Call before
+ * running operations that need files where the slave is authoritative.
+ *
+ * E.g. before a backup is made.
+ */
+function provision_drupal_sync_site_back() {
+  // synch filesystem changes back from the remote server.
+  d()->service('http')->fetch(d()->site_path . '/files/');
+  d()->service('http')->fetch(d()->site_path . '/private/');
+  d()->service('http')->fetch(d()->site_path . '/modules/');
+  d()->service('http')->fetch(d()->site_path . '/themes/');
+  d()->service('http')->fetch(d()->site_path . '/libraries/');
+  d()->service('http')->fetch(d()->site_path . '/local.settings.php');
+}
+
 /**
  * Generate a settings file for the site.
  *