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diff --git a/vendor/drupal/console/src/Command/Site/MaintenanceCommand.php b/vendor/drupal/console/src/Command/Site/MaintenanceCommand.php
new file mode 100644
index 000000000..3088e9c39
--- /dev/null
+++ b/vendor/drupal/console/src/Command/Site/MaintenanceCommand.php
@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Console\Command\Site\MaintenanceCommand.
+ */
+
+namespace Drupal\Console\Command\Site;
+
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Command\Command;
+use Drupal\Console\Core\Command\Shared\ContainerAwareCommandTrait;
+use Drupal\Console\Core\Style\DrupalStyle;
+use Drupal\Core\State\StateInterface;
+use Drupal\Console\Core\Utils\ChainQueue;
+
+class MaintenanceCommand extends Command
+{
+    use ContainerAwareCommandTrait;
+
+
+    /**
+     * @var StateInterface
+     */
+    protected $state;
+
+
+    /**
+     * @var ChainQueue
+     */
+    protected $chainQueue;
+
+    /**
+     * DebugCommand constructor.
+     *
+     * @param StateInterface $state
+     * @param ChainQueue     $chainQueue
+     */
+    public function __construct(
+        StateInterface $state,
+        ChainQueue $chainQueue
+    ) {
+        $this->state = $state;
+        $this->chainQueue = $chainQueue;
+        parent::__construct();
+    }
+
+    protected function configure()
+    {
+        $this
+            ->setName('site:maintenance')
+            ->setDescription($this->trans('commands.site.maintenance.description'))
+            ->addArgument(
+                'mode',
+                InputArgument::REQUIRED,
+                $this->trans('commands.site.maintenance.arguments.mode').'[on/off]'
+            );
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $io = new DrupalStyle($input, $output);
+
+        $mode = $input->getArgument('mode');
+        $stateName = 'system.maintenance_mode';
+        $modeMessage = null;
+        $cacheRebuild = true;
+
+        if ('ON' === strtoupper($mode)) {
+            $this->state->set($stateName, true);
+            $modeMessage = 'commands.site.maintenance.messages.maintenance-on';
+        }
+        if ('OFF' === strtoupper($mode)) {
+            $this->state->set($stateName, false);
+            $modeMessage = 'commands.site.maintenance.messages.maintenance-off';
+        }
+
+        if ($modeMessage === null) {
+            $modeMessage = 'commands.site.maintenance.errors.invalid-mode';
+            $cacheRebuild = false;
+        }
+
+        $io->info($this->trans($modeMessage));
+
+        if ($cacheRebuild) {
+            $this->chainQueue->addCommand('cache:rebuild', ['cache' => 'all']);
+        }
+    }
+}