Issue #3099295 by DukeandGrace, ravi.shankar, Chi, mradcliffe: Always return exit code in Symfony console commands

core/lib/Drupal/Core/Command/DbImportCommand.php

@@ -36,7 +36,7 @@ class DbImportCommand extends DbCommandBase {
     $script = $input->getArgument('script');
     if (!is_file($script)) {
       $output->writeln('File must exist.');
-      return;
+      return 1;
     }
 
     $connection = $this->getDatabaseConnection($input);

core/lib/Drupal/Core/Command/InstallCommand.php

@@ -126,6 +126,9 @@ class InstallCommand extends Command {
    *
    * @throws \Exception
    *   Thrown when failing to create the $site_path directory or settings.php.
+   *
+   * @return int
+   *   The command exit status.
    */
   protected function install($class_loader, SymfonyStyle $io, $profile, $langcode, $site_path, $site_name) {
     $password = Crypt::randomBytesBase64(12);
@@ -211,6 +214,8 @@ class InstallCommand extends Command {
     $progress_bar->finish();
     $io->writeln('<info>Username:</info> admin');
     $io->writeln("<info>Password:</info> $password");
+
+    return 0;
   }
 
   /**