Cache files permissions fix for Kohana Twig module - caching

Question

How to configure Kohana + Twig module so the Twig will set "writable by all" permissions on all of it's cache directory and it's descendant files?
So, for example, when I run my application through the Apache module (mod_php) and cache file owner is apache (or httpd) user, I will be able to remove cache files (to clean the cache or completely remove whole application) using regular user and ssh access.
I'm able to do it with Kohana's cache, but Twig's cache is created somehow differently.

Answer 1

It's not very easy, but not too complicated either. I have achieved state presented below by trial-and-error method.
Create a class that inherits from Twig_Cache_Filesystem and will be used instead of it. Check this out:
<?php
namespace Application\Twig;
class Cache_Filesystem extends \Twig_Cache_Filesystem
{
public function write($key, $content)
{
$old = umask(0000);
parent::write($key, $content);
umask($old);
}
}
Note, that this class must have it's name unique, so it is a good idea to namespace it. Also, it must be accessible to other code, so consider using composer's autoloading feature.
This is the fix itself, rest of the guide is just the way of implementing it into Kohana+Twig ecosystem.
Copy Twig.php from modules/kohana-twig/classes/Twig.php into your application's directory, i.e. application/classes/Twig.php (thank you Kohana's Cascading Filesystem!)
Modify a bit newly copied file, to let Twig_CacheInterface instance be passed in the config file (application/config/twig.php) instead of just a simple string (specifying to the Twig's cache directory). Take a look of my example:
<?php defined('SYSPATH') or die('No direct script access.');
class Twig extends Kohana_Twig
{
/**
* Initialize the Twig module
*
* #throws Kohana_Exception
* #return bool
*/
public static function init()
{
$path = Kohana::$config->load('twig.environment.cache');
if (is_string($path)) {
return parent::init();
} else if ($path instanceof Twig_CacheInterface) {
return true;
}
throw new Kohana_Exception('Twig cache could not be initialized');
}
}
In configuration file for kohana-twig module, i.e. application/config/twig.php (if not yet copied from module to your application, do it now), define environment.cache key like this:
return array(
'loader' => array(
'extension' => 'twig',
'path' => 'views',
),
'environment' => array(
'auto_reload' => (Kohana::$environment >= Kohana::TESTING),
'autoescape' => true,
'base_template_class' => 'Twig_Template',
// Following line is related to this issue and fix:
'cache' => new \Application\Twig\Cache_Filesystem(APPPATH . 'cache/twig'),
'charset' => 'utf-8',
'optimizations' => - 1,
'strict_variables' => false,
),
'functions' => array(),
'filters' => array(),
'tests' => array(),
}
This works for me. Hopefully it will help someone struggling with similar problem.