Drush multisite installation with existing config

[sgurlt]

Hey,

we are currently working on a multisite setup and just ran into a very strange bug.
I have setup a fresh Drupal 8.4.x installation with minimal setup, enabled views (for testing) and exported the config.

drush site-install minimal
drush -y en views
drush site-install cex

The config folder is located at ../config

Afterwards I want to create the first multisite using drush. So within my drupal root dir:

drush si --config-dir="../config" --sites-subdir="sub1.localhost" --db-url="mysql://root:root@mariadb/sub1"

The installation process works quite well, but the issue we have is that the config is not getting imported:

You are about to create a sites/sub1.localhost/settings.php file and CREATE the 'sub1' database. Do you want to continue? (y/n): y
Starting Drupal installation. This takes a while. Consider using the --notify global option.                                                                                                                                                                                                                                                                            [ok]
Installation complete.  User name: admin  User password: H32RC2zWMb                                                                                                                                                                                                                                                                                                     [ok]
Do you want to update uuid key in system.site config? (y/n): y
There are no changes to import.                                                                                                                                                                                                                                                                                                                                         [ok]
Congratulations, you installed Drupal!

I also tried doing it with a absolut path to my config:

drush si --config-dir="/var/www/html/config" --sites-subdir="sub2.localhost" --db-url="mysql://root:root@mariadb/sub2"

But it gave me the same result.

Tested Drush Versions:

• 8.1.13
• 8.1.16

Maybe someone got an idea what could go wrong?

[sgurlt]

Actually found the issue.

/**
 * Command callback.
 */
function drush_core_site_install($profile = NULL) {
  $args = func_get_args();
  $form_options = array();

  if ($args) {
    // The first argument is the profile.
    $profile = array_shift($args);
    // Subsequent arguments are additional form values.
    foreach ($args as $arg) {
      list($key, $value) = explode('=', $arg, 2);

      // Allow for numeric and NULL values to be passed in.
      if (is_numeric($value)) {
        $value = intval($value);
      }
      elseif ($value == 'NULL') {
        $value = NULL;
      }

      $form_options[$key] = $value;
    }
  }

  // If the profile is not explicitly set, default to the 'minimal' for an issue-free config import.
  if (empty($profile) && drush_get_option('config-dir')) {
    $profile = 'minimal';
  }

  drush_include_engine('drupal', 'site_install');
  drush_core_site_install_version($profile, $form_options);

  // Post installation, run the configuration import.
  if ($config = drush_get_option('config-dir')) {
    // Set the destination site UUID to match the source UUID, to bypass a core fail-safe.
    $source_storage = new FileStorage($config);
    $options = ['yes' => TRUE];
    drush_invoke_process('@self', 'config-set', array('system.site', 'uuid', $source_storage->read('system.site')['uuid']), $options);
    // Run a full configuration import.
    drush_invoke_process('@self', 'config-import', array(), array('source' => $config) + $options);
  }
}

drush_invoke_process('@self',
Always refers to the default site and not the multisite. I am digging into that.