How can I use "drush updb" to pass a value to the hook_update_N() implementation done from a module?

Question

I am trying to drush updb with an argument that is passed to the hook_update_N() implementation done from a module I wrote, which would use it to execute some update tasks.

function my_module_update_9001(&$value) {
  switch ($value) {
    case "unique":
      _set_unique_identifier();
      break;

    case "get":
      _get_field_typ_map();
      break;

    default:
      echo "Something went wrong...";
  }
}

function _set_unique_identifier() {
  _get_database_shame_connector()->uniqueIdentifier();
}
    
function _get_field_typ_map() {
  _get_database_shame_connector()->getFieldTypeMap();
}

How do I tell drush updb to pass an argument to an hook_update_N() implementation?

Answer 1

It's not possible because drush updb doesn't accept a parameter that is passed to hook_update_N() implementations, which makes sense, since the only parameter accepted from hook_update_N() is an array that allows that hook to use batch operations to run its updates. Passing a different argument to hook_update_N() implementations would cause issues with those implementations that use the batch API to run updates.

Even in the case drush updb would accept an argument to pass to an update hook and the function name for a hook_update_N() implementation, that implementation should be able to understand whether it's called by Drush with a different argument or by Drupal core with the expected argument.

There is a simpler way to execute code that runs after drush updb: Implement a post-command hook, as described on How to invoke a post drush command? for example.

namespace Drush\Commands;

class PostUpdateCommands extends DrushCommands {

  /**
   * Executes commands right after `drush updatedb`.
   *
   * @hook post-command updatedb
   *
   */
  public function postUpdate() {
    // Your code
  }

}