Fixed the check for local git repositories

src/Composer/Repository/Vcs/GitDriver.php

@@ -188,6 +188,7 @@ class GitDriver extends VcsDriver
         // local filesystem
         if (static::isLocalUrl($url)) {
             $process = new ProcessExecutor();
+            $url = str_replace('file://', '', $url);
             // check whether there is a git repo in that path
             if ($process->execute('git tag', $output, $url) === 0) {
                 return true;