mcp/app/Helpers/InstallHelper.php

<?php

namespace App\Helpers;

/**
 *  Helper for install 
 *
 *  @author Björn Hase, Tentakelfabrik
 *  @license http://opensource.org/licenses/MIT The MIT License
 *  @link https://gitea.tentakelfabrik.de/Tentakelfabrik/mcp
 *
 */
class InstallHelper
{
    // message for status
    const PACKAGE_STATUS = 'Status: install ok installed';

    // not allowed message
    const NOT_ALLOWED = [
        'WARNING: apt does not have a stable CLI interface. Use with caution in scripts.'
    ];

    /**
     *  check if a packege is installed
     *
     *  @param  string  $name
     *  @return boolean
     */
    public function isReady($name)
    {
        $result = false;

        exec('echo $(dpkg -s nginx 2>&1 | grep "'.self::PACKAGE_STATUS.'")', $output);

        if (isset($output[0]) && $output[0] === self::PACKAGE_STATUS) {
            $result = true;
        }

        return $result;
    }

    /**
     *  apt add a Warning for no good,
     *
     *
     *  @return array
     */
    public function filterAptMessages($output)
    {
        $results = [];

        foreach($output as $message) {
            if (!in_array($message, self::NOT_ALLOWED) && !empty($message)) {
                $results[] = $message;
            }
        }

        return $results;
    }
}