Magento image import script (doesn't work)

setImages.php

<?php
ini_set('memory_limit', '-1');

require 'app/Mage.php';
Mage::app();

echo "Loading catalog...\n";
$products = Mage::getModel('catalog/product')->setStoreId(13)->getCollection()->addAttributeToSelect('*');
echo count($products) . " products selected for image import.\n";
// Remove unset images, add image to gallery if exists
$importDir = Mage::getBaseDir('media') . DS . 'import/';

foreach ($products as $product) {
    $sku = Mage::getModel('catalog/product')->load($product->getId())->getSku();
	if (strstr($sku," ")) { 
		echo "Sku $sku contains whitespace, skipping.\n";
		continue; 
	}
	$imgFile = $sku . ".jpg";
	// Add three image sizes to media gallery
	$mediaArray = array(
		'thumbnail'   => $imgFile,
		'small_image' => $imgFile,
		'image'       => $imgFile,
	);
	
	foreach($mediaArray as $imageType => $fileName) {
		$filePath = $importDir.$fileName;
		if ( file_exists($filePath) ) {
			try {
				$product->addImageToMediaGallery($filePath, $imageType, false, false);
				$product->save();
				echo "Sku: $sku updated.\n";die();
			} catch (Exception $e) {
				echo $e->getMessage();
			}
		} else {
			echo "Could not match image to $sku. Path was: {$filePath}\n";break;
		}
	}
}