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diff --git a/vendor/drush/drush/lib/Drush/Boot/BaseBoot.php b/vendor/drush/drush/lib/Drush/Boot/BaseBoot.php
new file mode 100644
index 000000000..c816988c4
--- /dev/null
+++ b/vendor/drush/drush/lib/Drush/Boot/BaseBoot.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace Drush\Boot;
+
+use Drush\Log\LogLevel;
+
+abstract class BaseBoot implements Boot {
+
+  function __construct() {
+  }
+
+  function valid_root($path) {
+  }
+
+  function get_version($root) {
+  }
+
+  function command_defaults() {
+  }
+
+  function enforce_requirement(&$command) {
+    drush_enforce_requirement_bootstrap_phase($command);
+    drush_enforce_requirement_core($command);
+    drush_enforce_requirement_drush_dependencies($command);
+  }
+
+  function report_command_error($command) {
+    // Set errors related to this command.
+    $args = implode(' ', drush_get_arguments());
+    if (isset($command) && is_array($command)) {
+      foreach ($command['bootstrap_errors'] as $key => $error) {
+        drush_set_error($key, $error);
+      }
+      drush_set_error('DRUSH_COMMAND_NOT_EXECUTABLE', dt("The drush command '!args' could not be executed.", array('!args' => $args)));
+    }
+    elseif (!empty($args)) {
+      drush_set_error('DRUSH_COMMAND_NOT_FOUND', dt("The drush command '!args' could not be found.  Run `drush cache-clear drush` to clear the commandfile cache if you have installed new extensions.", array('!args' => $args)));
+    }
+    // Set errors that occurred in the bootstrap phases.
+    $errors = drush_get_context('DRUSH_BOOTSTRAP_ERRORS', array());
+    foreach ($errors as $code => $message) {
+      drush_set_error($code, $message);
+    }
+  }
+
+  function bootstrap_and_dispatch() {
+    $phases = $this->bootstrap_init_phases();
+
+    $return = '';
+    $command_found = FALSE;
+    _drush_bootstrap_output_prepare();
+    foreach ($phases as $phase) {
+      if (drush_bootstrap_to_phase($phase)) {
+        $command = drush_parse_command();
+        if (is_array($command)) {
+          $command += $this->command_defaults();
+          // Insure that we have bootstrapped to a high enough
+          // phase for the command prior to enforcing requirements.
+          $bootstrap_result = drush_bootstrap_to_phase($command['bootstrap']);
+          $this->enforce_requirement($command);
+
+          if ($bootstrap_result && empty($command['bootstrap_errors'])) {
+            drush_log(dt("Found command: !command (commandfile=!commandfile)", array('!command' => $command['command'], '!commandfile' => $command['commandfile'])), LogLevel::BOOTSTRAP);
+
+            $command_found = TRUE;
+            // Dispatch the command(s).
+            $return = drush_dispatch($command);
+
+            // Prevent a '1' at the end of the output.
+            if ($return === TRUE) {
+              $return = '';
+            }
+
+            if (drush_get_context('DRUSH_DEBUG') && !drush_get_context('DRUSH_QUIET')) {
+              // @todo Create version independant wrapper around Drupal timers. Use it.
+              drush_print_timers();
+            }
+            break;
+          }
+        }
+      }
+      else {
+        break;
+      }
+    }
+
+    if (!$command_found) {
+      // If we reach this point, command doesn't fit requirements or we have not
+      // found either a valid or matching command.
+      $this->report_command_error($command);
+    }
+    return $return;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function terminate() {
+  }
+}