Repack Magento Extension after running `tar xfvz extension.tgz`

archive.php

<?php

require_once 'abstract.php';

//
//
// PLEASE SET EDIT packages.xml and update md5 hashes!

class Mage_Shell_Archive extends Mage_Shell_Abstract
{

    public function run()
    {
        if ( $this->getArg('source') && $this->getArg('dest')  ) {

            $archive = new Mage_Archive_Tar();
            $archive->pack( $this->getArg('source'), $this->getArg('dest'), true );

            //$archive = new Mage_Archive_Gz();
            //$archive->pack( $this->getArg('dest').'.tmp' , $this->getArg('dest')  );

        } else {
            echo $this->usageHelp();
        }
    }

    public function usageHelp()
    {
        return <<<USAGE
Usage:  php -f archive.php -- [options]

  --source  source dir
  --dest    dest modulename.tgz

USAGE;
    }
}

$shell = new Mage_Shell_Archive();
$shell->run();