Load auth when updating a git repo mirror, fixes #3243

src/Composer/Repository/Vcs/GitDriver.php

@@ -56,16 +56,22 @@ class GitDriver extends VcsDriver
                 throw new \InvalidArgumentException('The source URL '.$this->url.' is invalid, ssh URLs should have a port number after ":".'."\n".'Use ssh://git@example.com:22/path or just git@example.com:path if you do not want to provide a password or custom port.');
             }
 
+            $gitUtil = new GitUtil($this->io, $this->config, $this->process, $fs);
+
             // update the repo if it is a valid git repository
             if (is_dir($this->repoDir) && 0 === $this->process->execute('git rev-parse --git-dir', $output, $this->repoDir) && trim($output) === '.') {
-                if (0 !== $this->process->execute('git remote update --prune origin', $output, $this->repoDir)) {
-                    $this->io->write('<error>Failed to update '.$this->url.', package information from this repository may be outdated ('.$this->process->getErrorOutput().')</error>');
+                try {
+                    $commandCallable = function ($url) {
+                        return sprintf('git remote set-url origin %s && git remote update --prune origin', escapeshellarg($url));
+                    };
+                    $gitUtil->runCommand($commandCallable, $this->url, $this->repoDir);
+                } catch (\Exception $e) {
+                    $this->io->write('<error>Failed to update '.$this->url.', package information from this repository may be outdated ('.$e->getMessage().')</error>');
                 }
             } else {
                 // clean up directory and do a fresh clone into it
                 $fs->removeDirectory($this->repoDir);
 
-                $gitUtil = new GitUtil($this->io, $this->config, $this->process, $fs);
                 $repoDir = $this->repoDir;
                 $commandCallable = function ($url) use ($repoDir) {
                     return sprintf('git clone --mirror %s %s', escapeshellarg($url), escapeshellarg($repoDir));