namespace Drupal\custom\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

class ValidateProductsForm extends FormBase {

    public function getFormId() {
        return 'validate_products_form';
    }

    public function buildForm(array $form, FormStateInterface $form_state) {

        $form['submit'] = [
            '#type' => 'submit',
            '#value' => 'Запустить проверку каталога',
            '#button_type' => 'primary',
        ];

        return $form;        
       
    }

    public function submitForm(array &$form, FormStateInterface $form_state) {

        shell_exec('drupal custom:validate_products');
        $messenger = \Drupal::messenger();
        $messenger->addMessage('Процесс запущен.');
       
    }
}