Re-order repos so that packagist always has the lowest priority

src/Composer/Factory.php

@@ -67,7 +67,7 @@ class Factory
         $binDir = getenv('COMPOSER_BIN_DIR') ?: $packageConfig['config']['bin-dir'];
 
         // initialize repository manager
-        $rm = $this->createRepositoryManager($io, $vendorDir);
+        $rm = $this->createRepositoryManager($io);
 
         // initialize download manager
         $dm = $this->createDownloadManager($io);
@@ -75,15 +75,17 @@ class Factory
         // initialize installation manager
         $im = $this->createInstallationManager($rm, $dm, $vendorDir, $binDir, $io);
 
-        // load package
-        $loader  = new Package\Loader\RootPackageLoader($rm);
-        $package = $loader->load($packageConfig);
-
         // load default repository unless it's explicitly disabled
         if (!isset($packageConfig['repositories']['packagist']) || $packageConfig['repositories']['packagist'] !== false) {
-            $rm->addRepository(new Repository\ComposerRepository(array('url' => 'http://packagist.org')));
+            $this->addPackagistRepository($rm);
         }
 
+        $this->addLocalRepository($rm, $vendorDir);
+
+        // load package
+        $loader  = new Package\Loader\RootPackageLoader($rm);
+        $package = $loader->load($packageConfig);
+
         // init locker
         $lockFile = substr($composerFile, -5) === '.json' ? substr($composerFile, 0, -4).'lock' : $composerFile . '.lock';
         $locker = new Package\Locker(new JsonFile($lockFile), $rm, md5_file($composerFile));
@@ -102,7 +104,6 @@ class Factory
     protected function createRepositoryManager(IOInterface $io, $vendorDir)
     {
         $rm = new Repository\RepositoryManager($io);
-        $rm->setLocalRepository(new Repository\FilesystemRepository(new JsonFile($vendorDir.'/.composer/installed.json')));
         $rm->setRepositoryClass('composer', 'Composer\Repository\ComposerRepository');
         $rm->setRepositoryClass('vcs', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('pear', 'Composer\Repository\PearRepository');
@@ -111,6 +112,16 @@ class Factory
         return $rm;
     }
 
+    protected function addLocalRepository(RepositoryManager $rm, $vendorDir)
+    {
+        $rm->setLocalRepository(new Repository\FilesystemRepository(new JsonFile($vendorDir.'/.composer/installed.json')));
+    }
+
+    protected function addPackagistRepository(RepositoryManager $rm)
+    {
+        $rm->addRepository(new Repository\ComposerRepository(array('url' => 'http://packagist.org')));
+    }
+
     protected function createDownloadManager(IOInterface $io)
     {
         $dm = new Downloader\DownloadManager();