Helper.php

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<?php
namespace Magento\Framework\Backup\Filesystem;

use Magento\Framework\Backup\Filesystem\Iterator\Filter;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;

class Helper
{
    const INFO_WRITABLE = 1;

    const INFO_READABLE = 2;

    const INFO_SIZE = 4;

    const INFO_ALL = 7;

    public function rm($path, $skipPaths = [], $removeRoot = false)
    {
        $filesystemIterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($path),
            RecursiveIteratorIterator::CHILD_FIRST
        );

        $iterator = new Filter($filesystemIterator, $skipPaths);

        foreach ($iterator as $item) {
            $item->isDir() ? @rmdir($item->__toString()) : @unlink($item->__toString());
        }

        if ($removeRoot && is_dir($path)) {
            @rmdir($path);
        }
    }

    public function getInfo($path, $infoOptions = self::INFO_ALL, $skipFiles = [])
    {
        $info = [];
        if ($infoOptions & self::INFO_READABLE) {
            $info['readable'] = true;
            $info['readableMeta'] = [];
        }

        if ($infoOptions & self::INFO_WRITABLE) {
            $info['writable'] = true;
            $info['writableMeta'] = [];
        }

        if ($infoOptions & self::INFO_SIZE) {
            $info['size'] = 0;
        }

        $filesystemIterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($path),
            RecursiveIteratorIterator::CHILD_FIRST
        );

        $iterator = new Filter($filesystemIterator, $skipFiles);

        foreach ($iterator as $item) {
            if ($item->isLink()) {
                continue;
            }

            if ($infoOptions & self::INFO_WRITABLE && !$item->isWritable()) {
                $info['writable'] = false;
                $info['writableMeta'][] = $item->getPathname();
            }

            if ($infoOptions & self::INFO_READABLE && !$item->isReadable()) {
                $info['readable'] = false;
                $info['readableMeta'][] = $item->getPathname();
            }

            if ($infoOptions & self::INFO_SIZE && !$item->isDir()) {
                $info['size'] += $item->getSize();
            }
        }

        return $info;
    }
}