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diff --git a/vendor/drush/drush/src/Boot/Kernels.php b/vendor/drush/drush/src/Boot/Kernels.php
new file mode 100644
index 000000000..dc7278a9b
--- /dev/null
+++ b/vendor/drush/drush/src/Boot/Kernels.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace Drush\Boot;
+
+use Drush\Drupal\DrupalKernel as DrushDrupalKernel;
+use Drush\Drupal\UpdateKernel as DrushUpdateKernel;
+use Drush\Drupal\InstallerKernel as DrushInstallerKernel;
+
+/**
+ * Defines the available kernels that can be bootstrapped.
+ */
+final class Kernels
+{
+
+    /**
+     * The default kernel that is used on standard requests.
+     *
+     * @var string
+     */
+    const DRUPAL = 'drupal';
+
+    /**
+     * The kernel that is used during database updates.
+     *
+     * @var string
+     */
+    const UPDATE = 'update';
+
+    /**
+     * The kernel that is used during site installation.
+     *
+     * @var string
+     */
+    const INSTALLER = 'installer';
+
+    /**
+     * Returns the available kernels.
+     */
+    public static function availableKernels()
+    {
+        return [
+            static::DRUPAL,
+            static::UPDATE,
+            static::INSTALLER,
+        ];
+    }
+
+    /**
+     * Returns the factory method that can be used to retrieve the given kernel.
+     *
+     * @param string $kernel
+     *   The kernel to retrieve.
+     *
+     * @return callable
+     *   The factory method.
+     */
+    public static function getKernelFactory($kernel)
+    {
+        $factories = [
+            Kernels::DRUPAL => [DrushDrupalKernel::class, 'createFromRequest'],
+            Kernels::UPDATE => [DrushUpdateKernel::class, 'createFromRequest'],
+            Kernels::INSTALLER => [DrushInstallerKernel::class, 'createFromRequest'],
+        ];
+        return $factories[$kernel];
+    }
+}