Allow using several git repos

- editcommit.php:
  - added a restriction not to use auto determined git repos found in directories above the DokuWiki configured $conf['savedir'].

Author: mhoffrog

action/editcommit.php

@@ -40,6 +40,8 @@ public function register(Doku_Event_Handler $controller) {
      * @return  GitRepo instance or null if there is no repo related to fileOrDirPath
      */
     private function initRepo($fileOrDirPath="") {
+        global $conf;
+        
         //set the path to the git binary
         $gitPath = trim($this->getConf('gitPath'));
         if ($gitPath !== '') {
@@ -57,6 +59,11 @@ private function initRepo($fileOrDirPath="") {
 			if (empty($repoPath)) {
 				return null;
 			}
+			// Validate that the git repoPath found is within or below the DokuWiki 'savedir' configured:
+			if (strpos(realpath($repoPath), realpath($conf['savedir'])) === false) {
+				//dbglog("GitBacked - WARNING: repoPath=".$repoPath." is above the configured savedir=".realpath($conf['savedir'])." => this git repo will be ignored!");
+				return null;
+			}
 			$repoWorkDir = '';
 		} else {
 			//get path to the repo root (by default DokuWiki's savedir)