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diff --git a/vendor/drush/drush/lib/Drush/Boot/Boot.php b/vendor/drush/drush/lib/Drush/Boot/Boot.php
new file mode 100644
index 000000000..9bad8e7ad
--- /dev/null
+++ b/vendor/drush/drush/lib/Drush/Boot/Boot.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace Drush\Boot;
+
+/**
+ * Defines the interface for a Boot classes.  Any CMS that wishes
+ * to work with Drush should extend BaseBoot.  If the CMS has a
+ * Drupal-Compatibility layer, then it should extend DrupalBoot.
+ *
+ * @todo Doc these methods.
+ */
+interface Boot {
+  /**
+   * This function determines if the specified path points to
+   * the root directory of a CMS that can be bootstrapped by
+   * the specific subclass that implements it.
+   *
+   * These functions should be written such that one and only
+   * one class will return TRUE for any given $path.
+   *
+   * @param $path to a directory to test
+   *
+   * @return TRUE if $path is a valid root directory
+   */
+  function valid_root($path);
+
+
+  /**
+   * Given a site root directory, determine the exact version of the software.
+   *
+   * @param string $root
+   *   The full path to the site installation, with no trailing slash.
+   * @return string|NULL
+   *   The version string for the current version of the software, e.g. 8.1.3
+   */
+  function get_version($root);
+
+  /**
+   * Main entrypoint to bootstrap the selected CMS and
+   * execute the selected command.
+   *
+   * The implementation provided in BaseBoot should be
+   * sufficient; this method usually will not need to
+   * be overridden.
+   */
+  function bootstrap_and_dispatch();
+
+  /**
+   * Returns an array that determines what bootstrap phases
+   * are necessary to bootstrap this CMS.  This array
+   * should map from a numeric phase to the name of a method
+   * (string) in the Boot class that handles the bootstrap
+   * phase.
+   *
+   * @see \Drush\Boot\DrupalBoot::bootstrap_phases()
+   *
+   * @return array of PHASE index => method name.
+   */
+  function bootstrap_phases();
+
+  /**
+   * List of bootstrap phases where Drush should stop and look for commandfiles.
+   *
+   * This allows us to bootstrap to a minimum neccesary to find commands.
+   *
+   * Once a command is found, Drush will ensure a bootstrap to the phase
+   * declared by the command.
+   *
+   * @return array of PHASE indexes.
+   */
+  function bootstrap_init_phases();
+
+  /**
+   * Return an array of default values that should be added
+   * to every command (e.g. values needed in enforce_requirements(),
+   * etc.)
+   */
+  function command_defaults();
+
+  /**
+   * Called by Drush when a command is selected, but
+   * before it runs.  This gives the Boot class an
+   * opportunity to determine if any minimum
+   * requirements (e.g. minimum Drupal version) declared
+   * in the command have been met.
+   *
+   * @return TRUE if command is valid. $command['bootstrap_errors']
+   * should be populated with an array of error messages if
+   * the command is not valid.
+   */
+  function enforce_requirement(&$command);
+
+  /**
+   * Called by Drush if a command is not found, or if the
+   * command was found, but did not meet requirements.
+   *
+   * The implementation in BaseBoot should be sufficient
+   * for most cases, so this method typically will not need
+   * to be overridden.
+   */
+  function report_command_error($command);
+
+  /**
+   * This method is called during the shutdown of drush.
+   *
+   * @return void
+   */
+  public function terminate();
+}