protected function _deleteUnusedProductImages ($letter)
{
// check to see if this upgrade step has already run once
// storage of this may be volatile but it's a compromise between using upgrade session (very volatile) and some new specific mysql table (permanent)
$key = 'upgrade:6100:deleteUnusedProductImages:' . $letter;
$keys = new Interspire_KeyStore;
if ($keys->exists($key)) {
return true;
}
// scan our product_images directory to begin detecting orphaned images
$base = ISC_BASE_PATH . '/' . GetConfig('ImageDirectory') . '/' . $letter;
$imageDirectoryLength = strlen(ISC_BASE_PATH . '/' . GetConfig('ImageDirectory') . '/');
$deleteCounter = 0;
$directory = new RecursiveDirectoryIterator($base);
foreach (new RecursiveIteratorIterator($directory) as $absoluteFilename => $current) {
if ($current->isDir()) {
// skip directories
continue;
}
if (DIRECTORY_SEPARATOR == "\\") {
// normalise the filename because DirectoryIterator will return \ on Windows but we store / in db
$absoluteFilename = str_replace("\\", "/", $absoluteFilename);
}
$filename = substr($absoluteFilename, $imageDirectoryLength);
// check that the filename matches our pattern of generated names such as __{random}_{size}.ext before
// deleting it, if it doesn't match then it's a file that probably wasn't generated by the product.image
// classes and we should leave it alone
if (!preg_match('#__[0-9]{5}(_(std|thumb|tiny|zoom))?\.[^.]+$#', $filename)) {
continue;
}
try {
if ($this->_isImageInUse($filename)) {
// filename exists in db somewhere; skip
continue;
}
} catch (Exception $exception) {
$this->SetError($exception->getMessage());
return false;
}
// remove this file
if (!unlink($absoluteFilename)) {
$this->SetError('unlink() failed for file: ' . $absoluteFilename);
return false;
}
$deleteCounter++;
}
// the key need only exist to flag the step as run, we can store whatever we want, so let's store when the step
// ran and the number of files which were deleted
$keys->set($key, time() . '.' . $deleteCounter);
return true;
}
