app/bundles/CoreBundle/Command/ApplyUpdatesCommand.php

<?php

namespace Mautic\CoreBundle\Command;

use Mautic\CoreBundle\Exception\UpdateFailedException;
use Mautic\CoreBundle\Helper\CoreParametersHelper;
use Mautic\CoreBundle\Helper\ProgressBarHelper;
use Mautic\CoreBundle\Update\StepProvider;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\ProgressBar;
use Symfony\Component\Console\Helper\SymfonyQuestionHelper;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Question\ConfirmationQuestion;
use Symfony\Contracts\Translation\TranslatorInterface;

/**
 * CLI Command to update the application.
 */
class ApplyUpdatesCommand extends Command
{
    public function __construct(
        private TranslatorInterface $translator,
        private StepProvider $stepProvider,
        private CoreParametersHelper $coreParametersHelper
    ) {
        parent::__construct();
    }

    protected function configure()
    {
        $this->setName('mautic:update:apply')
            ->setDefinition(
                [
                    new InputOption(
                        'force', null, InputOption::VALUE_NONE,
                        'Bypasses the verification check.'
                    ),
                    new InputOption(
                        'update-package',
                        'p', InputOption::VALUE_OPTIONAL, 'Optional full path to the update package to apply.'
                    ),
                    new InputOption(
                        'finish', null, InputOption::VALUE_NONE,
                        'Finalize the upgrade.'
                    ),
                ]
            )
            ->setHelp(
                <<<'EOT'
                The <info>%command.name%</info> command updates the Mautic application.

<info>php %command.full_name%</info>

You can optionally specify to bypass the verification check with the --force option:

<info>php %command.full_name% --force</info>

To force install a local package, pass the full path to the package as follows:

<info>php %command.full_name% --update-package=/path/to/updatepackage.zip</info>
EOT
            );
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        /** @var array<string, mixed> $options */
        $options = $input->getOptions();

        // Start a progress bar, don't give a max number of steps because it is conditional
        $progressBar = ProgressBarHelper::init($output);
        $progressBar->setFormat('Step %current% [%bar%] <info>%message%</info>');

        // Define this just in case
        if (!defined('MAUTIC_ENV')) {
            define('MAUTIC_ENV', $options['env'] ?? 'prod');
        }

        if (true === $this->coreParametersHelper->get('composer_updates', false)) {
            $output->writeln('<error>'.$this->translator->trans('mautic.core.command.update.composer').'</error>');

            return Command::FAILURE;
        }

        try {
            if (empty($options['finish'])) {
                $returnCode = $this->startUpgrade($input, $output, $progressBar);

                $output->writeln(
                    "\n\n<warning>".$this->translator->trans('mautic.core.command.update.finalize_instructions').'</warning>'
                );

                // Must hard exit here to prevent Symfony from trying to use the kernel while in the same PHP process
                exit($returnCode);
            }

            return $this->finishUpgrade($input, $output, $progressBar);
        } catch (UpdateFailedException $exception) {
            $output->writeln(
                "\n\n<error>".$exception->getMessage().'</error>'
            );
        }

        return Command::FAILURE;
    }

    /**
     * @throws UpdateFailedException
     */
    private function startUpgrade(InputInterface $input, OutputInterface $output, ProgressBar $progressBar): int
    {
        if (!$input->getOption('force')) {
            /** @var SymfonyQuestionHelper $helper */
            $helper   = $this->getHelperSet()->get('question');
            $question = new ConfirmationQuestion($this->translator->trans('mautic.core.update.confirm_application_update').' ', false);

            if (!$helper->ask($input, $output, $question)) {
                throw new UpdateFailedException($this->translator->trans('mautic.core.update.aborted'));
            }
        }

        foreach ($this->stepProvider->getInitialSteps() as $step) {
            $step->execute($progressBar, $input, $output);
        }

        return 0;
    }

    /**
     * @throws UpdateFailedException
     */
    private function finishUpgrade(InputInterface $input, OutputInterface $output, ProgressBar $progressBar): int
    {
        foreach ($this->stepProvider->getFinalSteps() as $step) {
            $step->execute($progressBar, $input, $output);
        }

        return 0;
    }

    protected static $defaultDescription = 'Updates the Mautic application';
}