GitLab: prevent invalid loop during composer install with invalid credentials

src/Composer/Util/AuthHelper.php

@@ -137,6 +137,7 @@ class AuthHelper
             $message = "\n".'Could not fetch '.$url.', enter your ' . $origin . ' credentials ' .($statusCode === 401 ? 'to access private repos' : 'to go over the API rate limit');
             $gitLabUtil = new GitLab($this->io, $this->config, null);
 
+            $auth = null;
             if ($this->io->hasAuthentication($origin)) {
                 $auth = $this->io->getAuthentication($origin);
                 if (in_array($auth['password'], array('gitlab-ci-token', 'private-token', 'oauth2'), true)) {
@@ -149,6 +150,12 @@ class AuthHelper
             ) {
                 throw new TransportException('Could not authenticate against '.$origin, 401);
             }
+
+            if ($auth !== null && $this->io->hasAuthentication($origin)) {
+                if ($auth === $this->io->getAuthentication($origin)) {
+                    throw new TransportException("Invalid credentials for '" . $url . "', aborting.", $statusCode);
+                }
+            }
         } elseif ($origin === 'bitbucket.org' || $origin === 'api.bitbucket.org') {
             $askForOAuthToken = true;
             $origin = 'bitbucket.org';

tests/Composer/Test/Util/AuthHelperTest.php

@@ -12,6 +12,7 @@
 
 namespace Composer\Test\Util;
 
+use Composer\Downloader\TransportException;
 use Composer\IO\IOInterface;
 use Composer\Test\TestCase;
 use Composer\Util\AuthHelper;
@@ -513,6 +514,41 @@ class AuthHelperTest extends TestCase
         $this->authHelper->storeAuth($origin, $storeAuth);
     }
 
+    public function testPromptAuthIfNeededGitLabNoAuthChange()
+    {
+        $this->setExpectedException('Composer\Downloader\TransportException');
+
+        $origin = 'gitlab.com';
+
+        $this->io
+            ->method('hasAuthentication')
+            ->with($origin)
+            ->willReturn(true);
+
+        $this->io
+            ->method('getAuthentication')
+            ->with($origin)
+            ->willReturn(array(
+                'username' => 'gitlab-user',
+                'password' => 'gitlab-password',
+            ));
+
+        $this->io
+            ->expects($this->once())
+            ->method('setAuthentication')
+            ->with('gitlab.com', 'gitlab-user', 'gitlab-password');
+
+        $this->config
+            ->method('get')
+            ->willReturnMap(array(
+                array('github-domains', 0, array()),
+                array('gitlab-domains', 0, array('gitlab.com')),
+                array('gitlab-token', 0, array('gitlab.com' => array('username' => 'gitlab-user', 'token' => 'gitlab-password'))),
+            ));
+
+        $this->authHelper->promptAuthIfNeeded('https://gitlab.com/acme/archive.zip', $origin, 404, 'GitLab requires authentication and it was not provided');
+    }
+
     /**
      * @param string                     $origin
      * @param array<string, string|null> $auth