#!/usr/bin/env bash

build() {
	if ! pacman -Qi tailscale >/dev/null 2>&1; then
		error "Package tailscale not installed"
		return 1
	fi

	local setupdir="/etc/initcpio/tailscale"
	for fn in tailscaled.state default.env; do
		if ! [[ -r "${setupdir}/${fn}" && -s "${setupdir}/${fn}" ]]; then
			error "Missing configuration file at ${setupdir}/${fn}. Have you run setup-initcpio-tailscale yet?"
			return 1
		fi
	done
	add_file ${setupdir}/default.env /etc/default/tailscaled
	add_file ${setupdir}/tailscaled.state /var/lib/tailscale/tailscaled.state

	# tailscale requirements
	add_module tun
	add_full_dir /usr/lib/xtables
	add_all_modules netfilter
	map add_binary iptables ip6tables tailscale tailscaled

	if [[ $(type -t add_systemd_unit ) == function ]]; then
		add_systemd_unit tailscaled.service
		add_systemd_drop_in tailscaled.service override <<-EOU
		[Unit]
		DefaultDependencies=no
		After=network-online.target
		Wants=network-online.target
		EOU
		add_symlink /etc/systemd/system/sysinit.target.wants/tailscaled.service \
								/usr/lib/systemd/system/tailscaled.service
	else
		add_runscript
	fi
}

help() {
	cat <<-__EOF_HELP__
	This hook enables tailscale service within initramfs.

	It copies all required files and binaries to initramfs and runs the Tailscale agent.
	Configuration is copied from the host into the initramfs per:
	
		* /etc/initcpio/tailscale/tailscaled.state to /var/lib/tailscale/tailscaled.state

		* /etc/initcpio/tailscale/default.env to /etc/default/tailscaled

	It works with both, systemd and busybox init systems; whatever you choose remember to also configure network and a ssh server hooks.

	For systemd init, see 'sd-network' and 'sd-tinyssh' hooks provided by mkinitcpio-systemd-extras package.

	Run /usr/bin/setup-initcpio-tailscale if you haven't already to initialize the configuration files at /etc/initcpio/tailscale/.

	For more check https://github.com/dangra/mkinitcpio-tailscale
	__EOF_HELP__
}

# vim: noexpandtab