def installed_version
        sh = shell_out('pkgutil --pkg-info com.getchef.pkg.chefdk')
        return false if sh.exitstatus.nonzero?
        ver = sh.stdout.match(/^version:\W+([0-9]+\.[0-9]+\.[0-9]+)$/)[1]
        ver == package_metadata[:version] ? 'latest' : ver