diff --git a/src/Composer/Repository/Vcs/HgDriver.php b/src/Composer/Repository/Vcs/HgDriver.php
new file mode 100644
index 000000000..6e58a3dda
--- /dev/null
+++ b/src/Composer/Repository/Vcs/HgDriver.php
@@ -0,0 +1,186 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Repository\Vcs;
+
+use Composer\Json\JsonFile;
+
+/**
+ * @author Per Bernhardt <plb@webfactory.de>
+ */
+class HgDriver implements VcsDriverInterface
+{
+    protected $url;
+    protected $tags;
+    protected $branches;
+    protected $rootIdentifier;
+    protected $infoCache = array();
+
+    public function __construct($url)
+	{
+        $this->url = $url;
+        $this->tmpDir = sys_get_temp_dir() . '/composer-' . preg_replace('{[^a-z0-9]}i', '-', $url) . '/';
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function initialize()
+    {
+        $url = escapeshellarg($this->url);
+        $tmpDir = escapeshellarg($this->tmpDir);
+        if (is_dir($this->tmpDir)) {
+            exec(sprintf('cd %s && hg pull -u', $tmpDir), $output);
+        } else {
+            exec(sprintf('hg clone %s %s', $url, $tmpDir), $output);
+        }
+
+        $this->getTags();
+        $this->getBranches();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getRootIdentifier()
+    {
+		$tmpDir = escapeshellarg($this->tmpDir);
+		if (null === $this->rootIdentifier) {
+			exec(sprintf('cd %s && hg tip --template "{rev}:{node|short}" --color never', $tmpDir), $output);
+			$this->rootIdentifier = $output[0];
+		}
+        return $this->rootIdentifier;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getUrl()
+    {
+        return $this->url;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getSource($identifier)
+    {
+        $label = array_search($identifier, (array) $this->tags) ?: $identifier;
+
+        return array('type' => 'hg', 'url' => $this->getUrl(), 'reference' => $label);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getDist($identifier)
+    {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getComposerInformation($identifier)
+    {
+        if (!isset($this->infoCache[$identifier])) {
+            exec(sprintf('cd %s && hg cat --color never -r %s composer.json', escapeshellarg($this->tmpDir), escapeshellarg($identifier)), $output);
+            $composer = implode("\n", $output);
+            unset($output);
+
+            if (!$composer) {
+                throw new \UnexpectedValueException('Failed to retrieve composer information for identifier '.$identifier.' in '.$this->getUrl());
+            }
+
+            $composer = JsonFile::parseJson($composer);
+
+            if (!isset($composer['time'])) {
+                exec(sprintf('cd %s && hg log --template "{date|rfc822date}" -r %s', escapeshellarg($this->tmpDir), escapeshellarg($identifier)), $output);
+                $date = new \DateTime($output[0]);
+                $composer['time'] = $date->format('Y-m-d H:i:s');
+            }
+            $this->infoCache[$identifier] = $composer;
+        }
+
+		return $this->infoCache[$identifier];
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getTags()
+    {
+        if (null === $this->tags) {
+            exec(sprintf('cd %s && hg tags --color never', escapeshellarg($this->tmpDir)), $output);
+			foreach ($output as $key => $tag) {
+				preg_match('(^([^\s]+)[\s]+[\d+]:(.*)$)', $tag, $match);
+				$tags[$match[1]] = $match[2];
+			}
+            unset($tags['tip']);
+			$this->tags = $tags;
+        }
+
+        return $this->tags;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getBranches()
+    {
+        if (null === $this->branches) {
+            $branches = array();
+
+            exec(sprintf('cd %s && hg branches --color never', escapeshellarg($this->tmpDir)), $output);
+            foreach ($output as $key => $branch) {
+				preg_match('(^([^\s]+)[\s]+[\d+]:(.*)$)', $branch, $match);
+				$branches[$match[1]] = $match[2];
+            }
+
+            $this->branches = $branches;
+        }
+
+        return $this->branches;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function hasComposerFile($identifier)
+    {
+        try {
+            $this->getComposerInformation($identifier);
+            return true;
+        } catch (\Exception $e) {
+        }
+
+        return false;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public static function supports($url, $deep = false)
+    {
+		if (preg_match('#(^(?:https?|ssh)://(?:[^@]@)?bitbucket.org|https://(?:.*?)\.kilnhg.com)#i', $url)) {
+            return true;
+        }
+
+        if (!$deep) {
+            return false;
+        }
+		
+		exec(sprintf('hg identify %s', escapeshellarg($url)), $output);
+
+        return (boolean) $output;
+    }
+}
diff --git a/src/Composer/Repository/VcsRepository.php b/src/Composer/Repository/VcsRepository.php
index ff17e5342..d5c741532 100644
--- a/src/Composer/Repository/VcsRepository.php
+++ b/src/Composer/Repository/VcsRepository.php
@@ -32,7 +32,7 @@ class VcsRepository extends ArrayRepository
         $drivers = array(
             'Composer\Repository\Vcs\GitHubDriver',
             'Composer\Repository\Vcs\GitDriver',
-            'Composer\Repository\Vcs\SvnDriver',
+            'Composer\Repository\Vcs\HgDriver',
         );
 
         foreach ($drivers as $driver) {