A drush script for reseting post_update hooks. For more details, see https://drupal.stackexchange.com/q/238682/11788

reset_hook_post_update_NAME.drush

#!../vendor/bin/drush

// <?php
// ^^^ For syntax highlighters only
//
// This is a drush shell script, designed to help debug and reset post_update
// hooks. For details, see: http://www.drush.org/en/master/shellscripts/

$key_value = \Drupal::keyValue('post_update');
$update_list = $key_value->get('existing_updates');
$most_recent_update = end($update_list);

drush_print("The most recent post_update hook is $most_recent_update");
$choice_1 = drush_confirm('Do you want to reset this hook?');
if ($choice_1) {
  $removed_el = array_pop($update_list);
  $key_value->set('existing_updates', $update_list);
  drush_print("$removed_el was reset");
} else {
  $choice_2 = drush_choice($update_list, dt('Which post_update hook do you want to reset?'));

  if ($choice_2) {
    $removed_el = $update_list[$choice_2];
    unset($update_list[$choice_2]);
    $key_value->set('existing_updates', $update_list);
    drush_print("$removed_el was reset");
  } else {
    drush_print("Reset was cancelled");
  }
}

This works well, I had to update the functions for Drush 10x. AND a gotcha is that when selecting '1' in the prompt it will return 0 which evaluates to false, so you need to use $choice !== FALSE. Also, with the new choice function the Cancel message is automatically handled

updated for Drupal 9.x Drush 10.x https://gist.github.com/wayne-weibel/01e7f00b32dbcb96eb2785817693483f