Modify Drupal's config UUIDs to match a config dir

uuid.php

<?php

use Symfony\Component\Yaml\Yaml;

global $config_directories;
$config_name = drush_shift();
if (!isset($config_directories[$config_name])) {
  print "No such config directory $config_name\n";
  exit;
}
$config_dir = $config_directories[$config_name];

/** @var \Drupal\Core\Config\ConfigFactoryInterface $config_factory */
$config_factory = \Drupal::service('config.factory');
$names = $config_factory->listAll();
$names = array_combine($names, $names);

$ymls = file_scan_directory($config_dir, '/\.yml$/', ['recurse' => FALSE]);
$change = [];
foreach ($ymls as $yml) {
  $content = Yaml::parse(file_get_contents($yml->uri));
  if (isset($content['uuid']) && isset($names[$yml->name])) {
    printf("Modifying %s\n", $yml->name);
    $config = $config_factory->getEditable($yml->name);
    $config->set('uuid', $content['uuid']);
    $config->save();
  }
}

If you try to import Drupal 8 CMI config into another site, it will try to delete and recreate all the config items, because of UUID mismatches. The import will then fail due to things like nodes being dependent on node type config. This makes it difficult to have multiple people work together on a site without sharing a database.

This script takes a CMI config directory as input, and changes the UUIDs of Drupal's config to match. A subsequent config import should succeed, updated config instead of deleting and recreating it.

To use:

drush php-script uuid.php sync
drush config-import sync