How can I output data from an install script during upgrade?

Question

I am trying to create an install script to overwrite some bluefoot configurations. I am trying to figure out what is in the $buttonItemBlock variable so that I can pass that to another class. However I can not get anything to print during upgrade in the console.

<?php

namespace vender\module\Setup;

use Gene\BlueFoot\Model\Installer\File as InstallerFile;
use Magento\Framework\Filesystem\Io\File as IoFile;
use Magento\Framework\Module\Dir\Reader;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Gene\BlueFoot\Model\Attribute\ContentBlockRepository;

/**
 * Class to install data for list builder BlueFoot block
 */
class InstallData implements InstallDataInterface
{
    /**
     * @var Reader
     */
    protected $moduleReader;

    /**
     * @var IoFile
     */
    protected $ioFile;

    /**
     * @var InstallerFile
     */
    protected $fileInstaller;

    /**
     * @var Bluefoot content block repository manager
     */
    protected $contentBlockRepository;

    /**
     * InstallData constructor.
     *
     * @param Reader $moduleReader
     * @param IoFile $ioFile
     * @param InstallerFile $fileInstaller
     */
    public function __construct(
        Reader $moduleReader,
        IoFile $ioFile,
        InstallerFile $fileInstaller,
        ContentBlockRepository $contentBlockRepository
    ) {
        $this->moduleReader = $moduleReader;
        $this->ioFile = $ioFile;
        $this->fileInstaller = $fileInstaller;
        $this->contentBlockRepository = $contentBlockRepository;
    }

    /**
     * Installs data for a module
     *
     * @param ModuleDataSetupInterface $setup
     * @param ModuleContextInterface $context
     */
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();

        $buttonItemBlock = $this->contentBlockRepository->getByIdentifier('button_item');
        var_dump($buttonItemBlock);exit;

        //Install the blocks and attributes
        //$this->installData($setup);

        $setup->endSetup();
    }
}

Answer 1

Shorter Logging to the file without logger object, in case you would need to log something fast:

$writer = new \Zend\Log\Writer\Stream(BP . '/var/log/debug.log');  
$logger = new \Zend\Log\Logger();  
$logger->addWriter($writer);  
$logger->info('MESSAGE');

You can try this one, maybe it will suit you needs.

Answer 2

You can just log to system.log using LoggerInterface Furman/ConsoleOutput/Setup/InstallData.php

<?php
/**
 * Created by PhpStorm.
 * User: dev
 * Date: 14.02.18
 * Time: 22:26
 */

namespace Furman\ConsoleOutput\Setup;

use Psr\Log\LoggerInterface;

class InstallData implements \Magento\Framework\Setup\InstallDataInterface
{
/**
 * @var LoggerInterface
 */
protected $logger;

/**
 * InstallData constructor.
 * @param LoggerInterface $logger
 */
public function __construct(
    LoggerInterface $logger
)
{
    $this->logger = $logger;
}

/**
 *
 * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
 */
public function 
install(\Magento\Framework\Setup\ModuleDataSetupInterface $setup, 
\Magento\Framework\Setup\ModuleContextInterface $context)
{
    $setup->startSetup();

    $this->logger->info('test log string');

    $setup->endSetup();
}

}

run at the root of your project

php bin/magento setup:upgrade

And see at the log file:

P.S. Don't forget to enable "Log to File" system/config settings at the admin panel Stores->Settings->Configuration->Advanced->Developer->Debug->Log to file

P.P.S. Output using echo also works fine: