Create a distinct and true theme for the installer, which is a million times...

Create a distinct and true theme for the installer, which is a million times saner than the alternative

project_template/web/profiles/drupal_cms_installer/drupal_cms_installer.info.yml

@@ -8,6 +8,7 @@ distribution:
   name: Drupal CMS
   install:
     finish_url: '/admin/dashboard/welcome'
+    theme: drupal_cms_installer_theme
 
 forms:
   - '\Drupal\RecipeKit\Installer\Form\RecipesForm'
@@ -24,20 +25,6 @@ recipes:
     drupal/drupal_cms_person: Person Profiles
     drupal/drupal_cms_project: Projects
 
-libraries-add:
-  claro/maintenance-page:
-    css:
-      theme:
-        css/gin-variables.css: {}
-        css/fonts.css: {}
-        css/installer-styles.css: {}
-        css/add-ons.css: {}
-    dependencies:
-      - core/once
-  core/drupal.progress:
-    js:
-      js/progress.js: {}
-
 # Explicitly provide an empty list of themes -- this prevents the installer from
 # injecting Stark into it.
 # @see install_profile_info()

project_template/web/profiles/drupal_cms_installer/drupal_cms_installer.profile

@@ -2,6 +2,7 @@
 
 declare(strict_types=1);
 
+use Drupal\Core\Extension\ModuleInstallerInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\RecipeKit\Installer\Hooks;
 use Drupal\RecipeKit\Installer\Messenger;
@@ -119,6 +120,7 @@ function drupal_cms_installer_form_install_configure_form_alter(array &$form): v
 }
 
 /**
+<<<<<<< Updated upstream
  * Implements hook_library_info_alter().
  */
 function drupal_cms_installer_library_info_alter(array &$libraries, string $extension): void {
@@ -133,8 +135,26 @@ function drupal_cms_installer_theme_registry_alter(array &$hooks): void {
 }
 
 /**
- * Preprocess function for all theme hooks.
+ * Uninstalls this install profile, as a final step.
+ *
+ * @see drupal_install_system()
  */
-function drupal_cms_installer_preprocess(array &$variables): void {
-  Hooks::preprocess($variables);
+function drupal_cms_installer_uninstall_myself(): void {
+  \Drupal::service(ModuleInstallerInterface::class)->uninstall([
+    'drupal_cms_installer',
+  ]);
+
+  // The install is done, so we don't need the list of applied recipes anymore.
+  \Drupal::state()->delete(RecipeAppliedSubscriber::STATE_KEY);
+
+  // Clear all previous status messages to avoid clutter.
+  \Drupal::messenger()->deleteByType(MessengerInterface::TYPE_STATUS);
+
+  // Invalidate the container in case any stray requests were made during the
+  // install process, which would have bootstrapped Drupal and cached the
+  // install-time container, which is now stale (during the installer, the
+  // container cannot be dumped, which would normally happen during the
+  // container rebuild triggered by uninstalling this profile). We do not want
+  // to redirect into Drupal with a stale container.
+  \Drupal::service('kernel')->invalidateContainer();
 }

project_template/web/profiles/drupal_cms_installer/themes/drupal_cms_installer_theme/drupal_cms_installer_theme.info.yml

+name: Drupal CMS Installer Theme
+type: theme
+core_version_requirement: '>=10.3'
+description: 'Themes the Drupal CMS installer. Not to be used in production.'
+base theme: claro
+libraries-extend:
+  claro/maintenance-page:
+    - drupal_cms_installer_theme/maintenance-page
+  core/drupal.progress:
+    - drupal_cms_installer_theme/drupal.progress

project_template/web/profiles/drupal_cms_installer/themes/drupal_cms_installer_theme/drupal_cms_installer_theme.libraries.yml

+maintenance-page:
+  css:
+    theme:
+      css/gin-variables.css: {}
+      css/fonts.css: {}
+      css/installer-styles.css: {}
+      css/add-ons.css: {}
+  dependencies:
+    - core/once
+
+drupal.progress:
+  js:
+    js/progress.js: {}

project_template/web/profiles/drupal_cms_installer/themes/drupal_cms_installer_theme/drupal_cms_installer_theme.theme

+<?php
+
+declare(strict_types=1);
+
+use Drupal\Core\File\FileUrlGeneratorInterface;
+
+function drupal_cms_installer_theme_preprocess(array &$variables): void {
+  // Don't show the version of Drupal.
+  unset($variables['site_version']);
+
+  $images_path = \Drupal::theme()->getActiveTheme()->getPath() . '/images';
+  $images_path = \Drupal::service(FileUrlGeneratorInterface::class)
+    ->generateString($images_path);
+  $variables['images_path'] = $images_path;
+}