<?php
 
abstract class MTrack_SCM_WorkingCopy {
    public $dir;
  
    /** returns the root dir of the working copy */
    function getDir() {
        return $this->dir;
    }
  
    /** add a file to the working copy */
    abstract function addFile($path);
    /** removes a file from the working copy */
    abstract function delFile($path);
    /** commit changes that are pending in the working copy */
    abstract function commit($CS);
    /** get an MTrackSCMFile representation of a file */
    abstract function getFile($path);
  
    /** enumerates files in a path in the working copy */
    function enumFiles($path)
    {
        return scandir($this->dir . DIRECTORY_SEPARATOR . $path);
    }
  
    /** determines if a file exists in the working copy */
    function file_exists($path)
    {
      return file_exists($this->dir . DIRECTORY_SEPARATOR . $path);
    }
  
    function __destruct()
    {
        if (strlen($this->dir) > 1) {
            $this->rmdir($this->dir);
            
            //System::rm('-r', $this->dir);
        }
    }
    
    function rmdir($dir) {
        require_once 'System.php';
        $rm = System::which('rm');
        $cmd = "$rm -rf " . escapeshellarg($dir);
        `$cmd`;
        
        
    }
    
    function generateTempDir()
    {
        
        /*$tn =  '/var/lib/php5/mtrackworkingdirlEwD96a';
        if (file_exists($tn)) {
            $this->rmdir($tn);
        }
        clearstatcache();
        if (file_exists($tn)) {
            die("OOPS");
        }
        return $tn;
        */
        $tn = tempnam(ini_get('session.save_path'),'mtrackworkingdir');
        unlink($tn);
        return $tn;
        
        
    }
    
    
}