Matthew Grasmick’s screencast about upgrading to Drupal 9 made me think it would be really fascinating if I also upgraded my site to Drupal 9 by keeping all the functionalities, including all the contributed extensions this site uses. No surprises – it took me more than 15 minutes 😶. And now, I’ll tell you, why.

This post is a list of the modules affected by the BC features removed from Drupal 9-alpha1, grouped by the change records.

Core version requirement key in info.yml files

  • Admin Toolbar (including submodules admin_toolbar_links_access_filter and admin_toolbar_tools)
  • Adminimal Admin Toolbar
  • Adminimal Theme
  • AdvAgg
  • Bootstrap (8.x-3.x)
  • CAPTCHA
  • Codesnippet
  • CodeTag
  • Config Ignore
  • Configuration Rewrite

Deprecated unmanaged file functions replaced with a service

These functions are: file_prepare_directory(), file_unmanaged_copy(), file_unmanaged_move(), file_unmanaged_save_data(), file_unmanaged_delete() etc.

  • AdvAgg
  • Bootstrap (8.x-3.x)
  • Configuration Rewrite

Several file URI/scheme functions deprecated and moved to \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface

  • AdvAgg

Use mb_* functions instead of Unicode::* methods

  • Bootstrap (8.x-3.x)

drupal_get_message() and drupal_set_message() replaced by Messenger service

  • Bootstrap (8.x-3.x)
  • EntityManager has been split into 11 classes
  • Codesnippet

Other Issues

  1. The Crop API module has a condition in its hook_requirements() implementation which assumes that the module is installed to Drupal core ^8 – and it only checks the minor version of the actual core.

So I had to apply this patch:



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   diff --git a/crop.install b/crop.install
   index 9d4fa79..771b801 100644
   --- a/crop.install
   +++ b/crop.install
   @@ -18,7 +18,7 @@ function crop_requirements($phase) {
   // media_entity 1.x enabled.
   $incompatible = FALSE;
   $drupal_version = explode('.', \Drupal::VERSION);
   -  if ($drupal_version[1] < 4) {
   +  if ($drupal_version[0] === 8 && $drupal_version[1] < 4) {
      $incompatible = TRUE;
      }
      elseif (\Drupal::moduleHandler()->moduleExists('media_entity')) {
  1. I also fixed something in the Paragraphs module’s ParagraphSelection handler.