Issue #3080649 by greg.1.anderson, larowlan, BinaryBlock, alexpott, danielnv18, Mile23: Drupal core scaffolding : path to vendor directory in generated autoload.php file is incorrect

composer/Plugin/Scaffold/GenerateAutoloadReferenceFile.php

@@ -38,12 +38,11 @@ final class GenerateAutoloadReferenceFile {
    */
   public static function generateAutoload(IOInterface $io, $package_name, $web_root, $vendor) {
     $autoload_path = static::autoloadPath($package_name, $web_root);
-    $location = dirname($autoload_path->fullPath());
     // Calculate the relative path from the webroot (location of the project
     // autoload.php) to the vendor directory.
     $fs = new Filesystem();
-    $relative_vendor_path = $fs->findShortestPath(realpath($location), $vendor);
+    $relative_autoload_path = $fs->findShortestPath($autoload_path->fullPath(), "$vendor/autoload.php");
-    file_put_contents($autoload_path->fullPath(), static::autoLoadContents($relative_vendor_path));
+    file_put_contents($autoload_path->fullPath(), static::autoLoadContents($relative_autoload_path));
     return new ScaffoldResult($autoload_path, TRUE);
   }
 
@@ -91,14 +90,14 @@ final class GenerateAutoloadReferenceFile {
   /**
    * Builds the contents of the autoload file.
    *
-   * @param string $vendor_path
+   * @param string $relative_autoload_path
-   *   The relative path to vendor.
+   *   The relative path to the autoloader in vendor.
    *
    * @return string
    *   Return the contents for the autoload.php.
    */
-  protected static function autoLoadContents($vendor_path) {
+  protected static function autoLoadContents($relative_autoload_path) {
-    $vendor_path = rtrim($vendor_path, '/');
+    $relative_autoload_path = preg_replace('#^\./#', '', $relative_autoload_path);
     return <<<EOF
 <?php
 
@@ -115,7 +114,7 @@ final class GenerateAutoloadReferenceFile {
  * @see core/modules/statistics/statistics.php
  */
 
-return require __DIR__ . '/{$vendor_path}/autoload.php';
+return require __DIR__ . '/{$relative_autoload_path}';
 
 EOF;
   }

composer/Plugin/Scaffold/ScaffoldFilePath.php

@@ -2,6 +2,8 @@
 
 namespace Drupal\Composer\Plugin\Scaffold;
 
+use Composer\Util\Filesystem;
+
 /**
  * Manage the path to a file to scaffold.
  *
@@ -61,6 +63,14 @@ class ScaffoldFilePath {
     $this->packageName = $package_name;
     $this->relativePath = $rel_path;
     $this->fullPath = $full_path;
+
+    // Ensure that the full path really is a full path. We do not use
+    // 'realpath' here because the file specified by the full path might
+    // not exist yet.
+    $fs = new Filesystem();
+    if (!$fs->isAbsolutePath($this->fullPath)) {
+      $this->fullPath = getcwd() . '/' . $this->fullPath;
+    }
   }
 
   /**

core/tests/Drupal/Tests/Composer/Plugin/Scaffold/Functional/ScaffoldTest.php

@@ -194,6 +194,7 @@ class ScaffoldTest extends TestCase {
     $result = $this->scaffoldSut($fixture_name, FALSE, FALSE);
     $this->assertContains('The allowed package fixtures/empty-fixture does not provide a file mapping for Composer Scaffold', $result->scaffoldOutput());
     $this->assertCommonDrupalAssetsWereScaffolded($result->docroot(), FALSE);
+    $this->assertAutoloadFileCorrect($result->docroot());
   }
 
   public function scaffoldOverridingSettingsExcludingHtaccessValues() {
@@ -229,6 +230,7 @@ class ScaffoldTest extends TestCase {
     $result = $this->scaffoldSut($fixture_name, $is_link, $relocated_docroot);
 
     $this->assertCommonDrupalAssetsWereScaffolded($result->docroot(), $is_link);
+    $this->assertAutoloadFileCorrect($result->docroot(), $relocated_docroot);
     $this->assertDefaultSettingsFromScaffoldOverride($result->docroot(), $is_link);
     $this->assertHtaccessExcluded($result->docroot());
   }
@@ -248,6 +250,7 @@ class ScaffoldTest extends TestCase {
     $this->assertScaffoldedFile($result->docroot() . '/keep-me.txt', FALSE, 'File in drupal-drupal-test-overwrite that is not replaced');
     $this->assertScaffoldedFile($result->docroot() . '/make-me.txt', FALSE, 'from assets that replaces file');
     $this->assertCommonDrupalAssetsWereScaffolded($result->docroot(), FALSE);
+    $this->assertAutoloadFileCorrect($result->docroot());
     $this->assertScaffoldedFile($result->docroot() . '/robots.txt', FALSE, $fixture_name);
   }
 
@@ -322,6 +325,7 @@ class ScaffoldTest extends TestCase {
 
     $this->assertScaffoldedFile($result->docroot() . '/robots.txt', FALSE, $robots_txt_contents);
     $this->assertCommonDrupalAssetsWereScaffolded($result->docroot(), $is_link);
+    $this->assertAutoloadFileCorrect($result->docroot());
   }
 
   /**
@@ -361,9 +365,7 @@ class ScaffoldTest extends TestCase {
    *   Whether or not symlinking is used.
    */
   protected function assertCommonDrupalAssetsWereScaffolded($docroot, $is_link) {
-    // Ensure that the autoload.php file was written.
+    // Assert scaffold files are written in the correct locations.
-    $this->assertFileExists($docroot . '/autoload.php');
-    // Assert other scaffold files are written in the correct locations.
     $this->assertScaffoldedFile($docroot . '/.csslintrc', $is_link, 'Test version of .csslintrc from drupal/core.');
     $this->assertScaffoldedFile($docroot . '/.editorconfig', $is_link, 'Test version of .editorconfig from drupal/core.');
     $this->assertScaffoldedFile($docroot . '/.eslintignore', $is_link, 'Test version of .eslintignore from drupal/core.');
@@ -378,4 +380,27 @@ class ScaffoldTest extends TestCase {
     $this->assertScaffoldedFile($docroot . '/web.config', $is_link, 'Test version of web.config from drupal/core.');
   }
 
+  /**
+   * Assert that the autoload file was scaffolded and contains correct path.
+   *
+   * @param string $docroot
+   *   Location of the doc root, where autoload.php should be written.
+   * @param bool $relocated_docroot
+   *   Whether the document root is relocated or now.
+   */
+  protected function assertAutoloadFileCorrect($docroot, $relocated_docroot = FALSE) {
+    $autoload_path = $docroot . '/autoload.php';
+
+    // Ensure that the autoload.php file was written.
+    $this->assertFileExists($autoload_path);
+    $contents = file_get_contents($autoload_path);
+
+    $expected = "return require __DIR__ . '/vendor/autoload.php';";
+    if ($relocated_docroot) {
+      $expected = "return require __DIR__ . '/../vendor/autoload.php';";
+    }
+
+    $this->assertContains($expected, $contents);
+  }
+
 }