Issue #2309731 by bendeguz.csirmaz, phenaproxima, alexpott:...

Issue #2309731 by bendeguz.csirmaz, phenaproxima, alexpott: drupal_check_profile() does not invoke the profile's hook_requirements()

core/includes/install.inc

@@ -991,6 +991,12 @@ function drupal_check_profile($profile) {
     }
   }
 
+  // Add the profile requirements.
+  $function = $profile . '_requirements';
+  if (function_exists($function)) {
+    $requirements = array_merge($requirements, $function('install'));
+  }
+
   return $requirements;
 }
 

core/profiles/testing_requirements/testing_requirements.info.yml

+name: 'Testing requirements'
+type: profile
+description: 'Profile for testing hook_requirements().'
+version: VERSION
+core: 8.x
+hidden: true

core/profiles/testing_requirements/testing_requirements.install

+<?php
+
+/**
+ * @file
+ * Install hooks for test profile.
+ */
+
+/**
+ * Implements hook_requirements().
+ */
+function testing_requirements_requirements($phase) {
+  $requirements = [];
+
+  if ($phase === 'install') {
+    $requirements['testing_requirements'] = [
+      'title' => t('Testing requirements'),
+      'severity' => REQUIREMENT_ERROR,
+      'description' => t('Testing requirements failed requirements.'),
+    ];
+  }
+
+  return $requirements;
+}

core/tests/Drupal/FunctionalTests/Installer/InstallerProfileRequirementsTest.php

+<?php
+
+namespace Drupal\FunctionalTests\Installer;
+
+/**
+ * Tests that an install profile can implement hook_requirements().
+ *
+ * @group Installer
+ */
+class InstallerProfileRequirementsTest extends InstallerTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $profile = 'testing_requirements';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpSettings() {
+    // This form will never be reached.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpSite() {
+    // This form will never be reached.
+  }
+
+  /**
+   * Assert that the profile failed hook_requirements().
+   */
+  public function testHookRequirementsFailure() {
+    $this->assertSession()->pageTextContains('Testing requirements failed requirements.');
+  }
+
+}