Merge branch '6776-borg-files-changed' into 'develop'

Allow exit code 1 from borg(files changed while backing up), #6776

Closes #6776

See merge request ispconfig/ispconfig3!1960

Author: Till Brehm

server/lib/classes/backup.inc.php

@@ -1994,7 +1994,11 @@ protected static function make_web_backup($web_domain, $backup_job)
                         'cd ? && ' . $command . ' ' . $command_opts . ' ' . $excludes . ' ? .',
                         $web_path, $backup_repos_path . '::' . $web_backup_archive
                     );
-                    $success = $app->system->last_exec_retcode() == 0;
+                    // Exit code 1 means a file changed during backup, not ideal but not a failure either.
+                    if ($app->system->last_exec_retcode() == 1) {
+                        $app->log('Backup of web files for domain ' . $web_domain['domain'] . ' using path ' . $web_path . ' mentined file changed while we backed it up.', LOGLEVEL_DEBUG);
+                    }
+                    $success = ($app->system->last_exec_retcode() == 0 || $app->system->last_exec_retcode() == 1)?true:false;
             }
 
             if ($success) {