src/Composer/Repository/RepositoryManager.php
public function createRepository($type, $config, $name = null)
    {
        if (!isset($this->repositoryClasses[$type])) {
            throw new \InvalidArgumentException('Repository type is not registered: '.$type);
        }

        if (isset($config['packagist']) && false === $config['packagist']) {
            $this->io->writeError('<warning>Repository "'.$name.'" ('.json_encode($config).') has a packagist key which should be in its own repository definition</warning>');
        }

        $class = $this->repositoryClasses[$type];

        $reflMethod = new \ReflectionMethod($class, '__construct');
        $params = $reflMethod->getParameters();
        if (isset($params[4]) && $params[4]->getClass() && $params[4]->getClass()->getName() === 'Composer\Util\RemoteFilesystem') {
            return new $class($config, $this->io, $this->config, $this->eventDispatcher, $this->rfs);
        }

        return new $class($config, $this->io, $this->config, $this->eventDispatcher);
    }
public function createRepository($type, $config, $name = null)
    {
        if (!isset($this->repositoryClasses[$type])) {
            throw new \InvalidArgumentException('Repository type is not registered: '.$type);
        }

        if (isset($config['packagist']) && false === $config['packagist']) {
            $this->io->writeError('<warning>Repository "'.$name.'" ('.json_encode($config).') has a packagist key which should be in its own repository definition</warning>');
        }

        $class = $this->repositoryClasses[$type];

        $reflMethod = new \ReflectionMethod($class, '__construct');
        $params = $reflMethod->getParameters();
        if (isset($params[4]) && $params[4]->getClass() && $params[4]->getClass()->getName() === 'Composer\Util\RemoteFilesystem') {
            return new $class($config, $this->io, $this->config, $this->eventDispatcher, $this->rfs);
        }

        return new $class($config, $this->io, $this->config, $this->eventDispatcher);
    }
Returns a new repository for a specific installation type.

@param  string                    $type   repository type
@param  array                     $config repository configuration
@param  string                    $name   repository name
@throws \InvalidArgumentException if repository for provided type is not registered
@return RepositoryInterface