gentoo-overlay/net-misc/knock/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<!-- maintainer-needed -->
	<use>
		<flag name="server">Installs the knockd server daemon.</flag>
	</use>
	<upstream>
		<remote-id type="github">jvinet/knock</remote-id>
	</upstream>
</pkgmetadata>