Metatag/ Workbench v1

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/**
 * Checks if this entity is the default revision (published).
 *
 * @param object $entity
 *   The entity object, e.g., $node.
 *
 * @return bool
 *   TRUE if the entity is the default revision, FALSE otherwise.
 */
function _metatag_isdefaultrevision($entity) {
  // D7 "Forward revisioning" is complex and causes a node_save() with the
  // future node in node table. This fires hook_node_update() twice and cause
  // abnormal behaviour in metatag.
  //
  // The steps taken by Workbench Moderation is to save the forward revision
  // first and overwrite this with the live version in a shutdown function in
  // a second step. This will confuse metatag. D7 has no generic property
  // in the node object, if the node that is updated is the 'published' version
  // or only a draft of a future version.
  //
  // This behaviour will change in D8 where $node->isDefaultRevision has been
  // introduced. See below links for more details.
  // - http://drupal.org/node/1879482
  // - http://drupal.org/node/218755
  // - http://drupal.org/node/1522154
  //
  // Every moderation module saving a forward revision needs to return FALSE.
  // @todo: Refactor this workaround under D8.

  // Support for Workbench Moderation v1 - if this is a node, check if the
  // content type supports moderation.
  if (function_exists('workbench_moderation_node_type_moderated') && workbench_moderation_node_type_moderated($entity->type) === TRUE) {
    return !empty($entity->workbench_moderation['updating_live_revision']);
  }
  return FALSE;
}


...


function metatag_entity_insert($entity, $entity_type) {

...

    // Support for Workbench Moderation v1.
    if ($entity_type == 'node' && _metatag_isdefaultrevision($entity)) {
      return;
    }
    
}

...


/**
 * Implements hook_entity_update().
 */
function metatag_entity_update($entity, $entity_type) {
...

    // Support for Workbench Moderation v1.
    if ($entity_type == 'node' && _metatag_isdefaultrevision($entity)) {
      return;
    }
...
}