diff --git a/src/Composer/Installer/Registry/FilesystemRegistry.php b/src/Composer/Installer/Registry/FilesystemRegistry.php
new file mode 100644
index 000000000..755e034b2
--- /dev/null
+++ b/src/Composer/Installer/Registry/FilesystemRegistry.php
@@ -0,0 +1,126 @@
+<?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\Installer\Registry;
+
+use Composer\Package\PackageInterface;
+
+/**
+ * Filesystem registry.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+class FilesystemRegistry implements RegistryInterface
+{
+    private $registryFile;
+    private $registry = array();
+
+    /**
+     * Initializes filesystem registry.
+     *
+     * @param   string  $group  registry (installer) group
+     */
+    public function __construct($composerCachePath, $group)
+    {
+        $this->registryFile = rtrim($composerCachePath, '/').'/'.$group.'-reg.json';
+        $registryPath = dirname($this->registryFile);
+
+        if (!is_dir($registryPath)) {
+            if (file_exists($registryPath)) {
+                throw new \UnexpectedValueException(
+                    $registryPath.' exists and is not a directory.'
+                );
+            }
+            if (!mkdir($registryPath, 0777, true)) {
+                throw new \UnexpectedValueException(
+                    $registryPath.' does not exist and could not be created.'
+                );
+            }
+        }
+    }
+
+    /**
+     * Opens registry (read file / opens connection).
+     */
+    public function open()
+    {
+        if (is_file($this->registryFile)) {
+            $this->registry = json_decode(file_get_contents($this->registryFile), true);
+        }
+    }
+
+    /**
+     * Closes registry (writes file / closes connection).
+     */
+    public function close()
+    {
+        file_put_contents($this->registryFile, json_encode($this->registry));
+    }
+
+    /**
+     * Checks if specified package registered (installed).
+     *
+     * @param   PackageInterface    $package    package instance
+     *
+     * @return  Boolean
+     */
+    public function isPackageRegistered(PackageInterface $package)
+    {
+        $packageId = $package->getUniqueName();
+
+        return isset($this->registry[$packageId]);
+    }
+
+    /**
+     * Returns installer type for the registered package.
+     *
+     * @param   PackageInterface    $package    package instance
+     *
+     * @return  string
+     */
+    public function getRegisteredPackageInstallerType(PackageInterface $package)
+    {
+        $packageId = $package->getUniqueName();
+
+        if (isset($this->registry[$packageId])) {
+            return $this->registry[$packageId];
+        }
+    }
+
+    /**
+     * Registers package in registry.
+     *
+     * @param   PackageInterface    $package    package instance
+     * @param   string              $type       installer type with which package were been
+     *                                          installed
+     */
+    public function registerPackage(PackageInterface $package, $type)
+    {
+        $packageId = $package->getUniqueName();
+
+        $this->registry[$packageId] = $type;
+    }
+
+    /**
+     * Removes package from registry.
+     *
+     * @param   PackageInterface    $package    package instance
+     */
+    public function unregisterPackage(PackageInterface $package)
+    {
+        $packageId = $package->getUniqueName();
+
+        if (isset($this->registry[$packageId])) {
+            unset($this->registry[$packageId]);
+        }
+    }
+}
diff --git a/src/Composer/Installer/Registry/RegistryInterface.php b/src/Composer/Installer/Registry/RegistryInterface.php
new file mode 100644
index 000000000..7fdf63f8a
--- /dev/null
+++ b/src/Composer/Installer/Registry/RegistryInterface.php
@@ -0,0 +1,67 @@
+<?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\Installer\Registry;
+
+use Composer\Package\PackageInterface;
+
+/**
+ * Installer registry interface.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+interface RegistryInterface
+{
+    /**
+     * Opens registry (read file / opens connection).
+     */
+    function open();
+
+    /**
+     * Closes registry (writes file / closes connection).
+     */
+    function close();
+
+    /**
+     * Checks if specified package registered (installed).
+     *
+     * @param   PackageInterface    $package    package instance
+     *
+     * @return  Boolean
+     */
+    function isPackageRegistered(PackageInterface $package);
+
+    /**
+     * Returns installer type for the registered package.
+     *
+     * @param   PackageInterface    $package    package instance
+     *
+     * @return  string
+     */
+    function getRegisteredPackageInstallerType(PackageInterface $package);
+
+    /**
+     * Registers package in registry.
+     *
+     * @param   PackageInterface    $package    package instance
+     * @param   string              $type       installer type with which package were been
+     *                                          installed
+     */
+    function registerPackage(PackageInterface $package, $type);
+
+    /**
+     * Removes package from registry.
+     *
+     * @param   PackageInterface    $package    package instance
+     */
+    function unregisterPackage(PackageInterface $package);
+}
diff --git a/tests/Composer/Test/Installer/Registry/FilesystemRegistryTests.php b/tests/Composer/Test/Installer/Registry/FilesystemRegistryTests.php
new file mode 100644
index 000000000..d3aaf7fc6
--- /dev/null
+++ b/tests/Composer/Test/Installer/Registry/FilesystemRegistryTests.php
@@ -0,0 +1,156 @@
+<?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\Test\Installer\Registry;
+
+use Composer\Installer\Registry\FilesystemRegistry;
+
+class FilesystemRegistryTest extends \PHPUnit_Framework_TestCase
+{
+    private $dir;
+    private $registryFile;
+
+    protected function setUp()
+    {
+        $this->dir = sys_get_temp_dir().'/.composer';
+        $this->registryFile = $this->dir.'/some_registry-reg.json';
+
+        if (file_exists($this->registryFile)) {
+            unlink($this->registryFile);
+        }
+    }
+
+    public function testRegistryCreation()
+    {
+        $this->assertFileNotExists($this->registryFile);
+        $registry = new FilesystemRegistry($this->dir, 'some_registry');
+
+        $registry->open();
+        $registry->close();
+        $this->assertFileExists($this->registryFile);
+
+        file_put_contents($this->registryFile, json_encode(array(
+            'package1-1.0.0-beta' => 'library'
+        )));
+
+        $registry->open();
+        $registry->close();
+        $this->assertFileExists($this->registryFile);
+
+        $data = json_decode(file_get_contents($this->registryFile), true);
+        $this->assertEquals(array('package1-1.0.0-beta' => 'library'), $data);
+    }
+
+    public function testIsPackageRegistered()
+    {
+        file_put_contents($this->registryFile, json_encode(array(
+            'package1-1.0.0-beta' => 'library'
+        )));
+
+        $registry = new FilesystemRegistry($this->dir, 'some_registry');
+        $registry->open();
+
+        $package1 = $this->createPackageMock();
+        $package1
+            ->expects($this->once())
+            ->method('getUniqueName')
+            ->will($this->returnValue('package1-1.0.0-beta'));
+        $package2 = $this->createPackageMock();
+        $package2
+            ->expects($this->once())
+            ->method('getUniqueName')
+            ->will($this->returnValue('package2-1.1.0-stable'));
+
+        $this->assertTrue($registry->isPackageRegistered($package1));
+        $this->assertFalse($registry->isPackageRegistered($package2));
+
+        $registry->close();
+    }
+
+    public function testGetRegisteredPackageInstallerType()
+    {
+        $package1 = $this->createPackageMock();
+        $package1
+            ->expects($this->once())
+            ->method('getUniqueName')
+            ->will($this->returnValue('package1-1.0.0-beta'));
+        $package2 = $this->createPackageMock();
+        $package2
+            ->expects($this->once())
+            ->method('getUniqueName')
+            ->will($this->returnValue('package2-1.1.0-stable'));
+
+        file_put_contents($this->registryFile, json_encode(array(
+            'package1-1.0.0-beta'   => 'library',
+            'package2-1.1.0-stable' => 'bundle'
+        )));
+
+        $registry = new FilesystemRegistry($this->dir, 'some_registry');
+        $registry->open();
+
+        $this->assertSame('library', $registry->getRegisteredPackageInstallerType($package1));
+        $this->assertSame('bundle', $registry->getRegisteredPackageInstallerType($package2));
+
+        $registry->close();
+    }
+
+    public function testRegisterPackage()
+    {
+        $package = $this->createPackageMock();
+        $package
+            ->expects($this->once())
+            ->method('getUniqueName')
+            ->will($this->returnValue('package1-1.0.0-beta'));
+
+        $registry = new FilesystemRegistry($this->dir, 'some_registry');
+        $registry->open();
+
+        $registry->registerPackage($package, 'library');
+
+        $registry->close();
+
+        $data = json_decode(file_get_contents($this->registryFile), true);
+
+        $this->assertEquals(array('package1-1.0.0-beta' => 'library'), $data);
+    }
+
+    public function testUnregisterPackage()
+    {
+        $package = $this->createPackageMock();
+        $package
+            ->expects($this->once())
+            ->method('getUniqueName')
+            ->will($this->returnValue('package1-1.0.0-beta'));
+
+        file_put_contents($this->registryFile, json_encode(array(
+            'package1-1.0.0-beta'   => 'library',
+            'package2-1.1.0-stable' => 'bundle'
+        )));
+
+        $registry = new FilesystemRegistry($this->dir, 'some_registry');
+        $registry->open();
+
+        $registry->unregisterPackage($package);
+
+        $registry->close();
+
+        $data = json_decode(file_get_contents($this->registryFile), true);
+
+        $this->assertEquals(array('package2-1.1.0-stable' => 'bundle'), $data);
+    }
+
+    private function createPackageMock()
+    {
+        return $this->getMockBuilder('Composer\Package\PackageInterface')
+            ->getMock();
+    }
+}