Composer\Satis\Console\Command\BuildCommand::getComposerHome PHP Метод

    private function getComposerHome()
    {
        $home = getenv('COMPOSER_HOME');
        if (!$home) {
            if (defined('PHP_WINDOWS_VERSION_MAJOR')) {
                if (!getenv('APPDATA')) {
                    throw new \RuntimeException('The APPDATA or COMPOSER_HOME environment variable must be set for composer to run correctly');
                }
                $home = strtr(getenv('APPDATA'), '\\', '/') . '/Composer';
            } else {
                if (!getenv('HOME')) {
                    throw new \RuntimeException('The HOME or COMPOSER_HOME environment variable must be set for composer to run correctly');
                }
                $home = rtrim(getenv('HOME'), '/') . '/.composer';
            }
        }
        return $home;
    }