IM RAW disappears from Imagecache, alls pictures displayed unprocessed

Forgot to mention that disabling and re-enabling the module makes IM RAW and all of its actions re-appear in Imagecache.

Changing this to critical as it's a site breaking bug for production pages.

Well I'm still clueless as to why this is happening. However, if you need a temporary fix, you can put the following code in hook_cron of your own module or im_raw (make sure the cronjob runs often enough, like once per hour):

module_disable(array('im_raw'));
module_enable(array('im_raw'));

I know it ain't pretty, but at least it works this way until the problem has been solved.

Yes, unfortunately it's happening regularly, often multiple times a day.

Actually, better don't use the hook_cron trick above, it seems to make the module fail more often than fixing it. Though, maybe it can be used repeatedly to track down the problem?

Thank god I finally found the damn bug!

The problem is the permission check in:

function im_raw_imagecache_actions() {
  if (user_access('Allow user to enter raw ImageMagick command options')) {
    $actions = array(
      'im_raw' => array(
        'name' => 'IM raw',
        'description' => 'Enter raw imagemagick command line options.'
      )
    );
    return $actions;
  }
}

A regular user doesn't have permission to enter IM RAW commands of course, which causes this function to return nothing and thus imagecache sees no IM RAW actions. However, because imagecache caches these action arrays, the module works until the cache is reset and imagecache recalls this function from a user without permission.

You can test this by disabling imagecache actions caching by inserting false into the if condition in imagecache.module on line 246. Thus, the code will always go to the else condition and try to load actions from the module hooks, which fails for IM RAW if the user has no permission to edit IM RAW actions. Use 2 browsers to test, one with a user with IM RAW permission to flush a test preset and another one with an anonymous user to view the test image.

The attached patch simply removes the permission check. I'm not sure if a permission is needed at all for IM RAW, as there's already an administer imagecache permission.