How to pass current node revision id from triggered rule to scheduled rule

Well, I got something working.

I had to create a small module to provide a new Rules event "a new moderated revision was created", and new action "published specified revision".

These supply and require (respectively) an additional "number" argument, the node revision id at the time the revision is created. This can then be passed through the Rules UI as an argument, and stored by the Rules Scheduler.

This avoids the problem of getting node->vid from the "content" variable, which appears to be obtained from node_load(), and therefore returns the "current" (published) revision id, not the specified (unpublished, moderated) revision id.

I'll post sample code on request - I'm using the Revisioning module (D6).

This code uses the Revisioning module for the function _revisioning_publish_revision().

It adds a Rules event/action combo with an extra available argument - the new revision vid - and fires the event trigger from the hook_nodeapi() insert and update operations. The argument must be specified in your Rule Set and your Triggered Rule, so it will be stored for later use by the Scheduler.

<?php
/**
 * Implementation of hook_nodeapi().
 */
function mymodule_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
  switch ($op) {    
    case 'update':
    case 'insert':
      if ($node->revision && $node->revision_moderation) {
        // invoke the rules action
        if (module_exists('rules')) {
          rules_invoke_event('mymodule_rules_event_pending_revision_created', $node, $node->vid); 
        }
      }
    
      break;
  }
}

/**
 * Implementation of hook_rules_event_info().
 */
function mymodule_rules_event_info() {
  return array(
    'mymodule_rules_event_pending_revision_created' => array(
      'label' => t('New pending revision created'),
      'module' => 'My Module',
      'arguments' => array(
        'node' => array('type' => 'node', 'label' => t('Content')),
        'vid' => array('type' => 'number', 'label' => t('Revision ID')),
      ),
    ),
  );
}

/**
 * Implementation of hook_rules_action_info().
 */
function mymodule_rules_action_info() {
   return array(
    'mymodule_rules_action_publish_revision' => array(
      'label' => t('Publish the specified revision'),
      'module' => 'My Module',
      'arguments' => array(
        'node' => array('type' => 'node', 'label' => t('Content')),
        'vid' => array('type' => 'number', 'label' => t('Revision ID')),
      ),
    ),
  );
}

/**
 * Action: publish specified revision.
 *
 * @note, no checks for appropriate Revisioning permissions are performed
 */
function mymodule_rules_action_publish_revision($node, $vid) {
  _revisioning_publish_revision($node->nid, $vid);
}