#!/usr/bin/env bash
# shellcheck disable=SC2154

check() {
	# We depend on udev-rules being loaded
	[ "${1}" = "-d" ] && return 0

	# Verify the zfs tool chain
	for tool in "@sbindir@/zgenhostid" "@sbindir@/zpool" "@sbindir@/zfs" "@mounthelperdir@/mount.zfs" ; do
		test -x "$tool" || return 1
	done

	return 0
}

depends() {
	echo udev-rules
	return 0
}

installkernel() {
	instmods -c zfs
}

install() {
	inst_rules 90-zfs.rules 69-vdev.rules 60-zvol.rules
	
	inst_multiple \
		zgenhostid \
		zfs \
		zpool \
		mount.zfs \
		hostid \
		grep \
		awk \
		tr \
		cut \
		head ||
		{ dfatal "Failed to install essential binaries"; exit 1; }
	
	# Lines 71-90 adapted from
	# https://github.com/zbm-dev/zfsbootmenu/blob/9a03eab2b75647170bdc383903735a694ecd0ed6/dracut/module-setup.sh#L71
	
	if ! ldd "$( command -v zpool )" | grep -qF 'libgcc_s.so'; then
		# On systems with gcc-config (Gentoo, Funtoo, etc.), use it to find libgcc_s
		if command -v gcc-config >/dev/null 2>&1; then
			dracut_install "/usr/lib/gcc/$(s=$(gcc-config -c); echo "${s%-*}/${s##*-}")/libgcc_s.so.1" ||
				{ dfatal "Unable to install libgcc_s.so"; exit 1; }
			# Otherwise, use dracut's library installation function to find the right one
		elif ! inst_libdir_file "libgcc_s.so*"; then
			# If all else fails, just try looking for some gcc arch directory
			dracut_install /usr/lib/gcc/*/*/libgcc_s.so* ||
				{ dfatal "Unable to install libgcc_s.so"; exit 1; }
		fi
	fi

	inst_hook cmdline 95 "${moddir}/parse-zfs.sh"
	if [ -n "$systemdutildir" ] ; then
		inst_script "${moddir}/zfs-generator.sh" "$systemdutildir"/system-generators/dracut-zfs-generator
	fi
	inst_hook pre-mount 90 "${moddir}/zfs-load-key.sh"
	inst_hook mount 98 "${moddir}/mount-zfs.sh"
	inst_hook cleanup 99 "${moddir}/zfs-needshutdown.sh"
	inst_hook shutdown 20 "${moddir}/export-zfs.sh"

	inst_simple "${moddir}/zfs-lib.sh" "/lib/dracut-zfs-lib.sh"
	if [ -e @sysconfdir@/zfs/zpool.cache ]; then
		inst @sysconfdir@/zfs/zpool.cache
		type mark_hostonly >/dev/null 2>&1 && mark_hostonly @sysconfdir@/zfs/zpool.cache
	fi

	if [ -e @sysconfdir@/zfs/vdev_id.conf ]; then
		inst @sysconfdir@/zfs/vdev_id.conf
		type mark_hostonly >/dev/null 2>&1 && mark_hostonly @sysconfdir@/zfs/vdev_id.conf
	fi

	# Synchronize initramfs and system hostid
	if [ -f @sysconfdir@/hostid ]; then
		inst @sysconfdir@/hostid
		type mark_hostonly >/dev/null 2>&1 && mark_hostonly @sysconfdir@/hostid
	elif HOSTID="$(hostid 2>/dev/null)" && [ "${HOSTID}" != "00000000" ]; then
		zgenhostid -o "${initdir}@sysconfdir@/hostid" "${HOSTID}"
		type mark_hostonly >/dev/null 2>&1 && mark_hostonly @sysconfdir@/hostid
	fi

	if dracut_module_included "systemd"; then

		dracut_install \
			systemd-ask-password \
			systemd-tty-ask-password-agent ||
			{ dfatal "Failed to install essential systemd binaries"; exit 1; }

		mkdir -p "${initdir}/$systemdsystemunitdir/zfs-import.target.wants"
		for _service in "zfs-import-scan.service" "zfs-import-cache.service" ; do
			dracut_install "@systemdunitdir@/$_service"
			if ! [ -L "${initdir}/$systemdsystemunitdir/zfs-import.target.wants/$_service" ]; then
				ln -sf "../$_service" "${initdir}/$systemdsystemunitdir/zfs-import.target.wants/$_service"
				type mark_hostonly >/dev/null 2>&1 && mark_hostonly "@systemdunitdir@/$_service"
			fi
		done

		inst "${moddir}"/zfs-env-bootfs.service "${systemdsystemunitdir}"/zfs-env-bootfs.service
		ln -s ../zfs-env-bootfs.service "${initdir}/${systemdsystemunitdir}/zfs-import.target.wants"/zfs-env-bootfs.service
		type mark_hostonly >/dev/null 2>&1 && mark_hostonly @systemdunitdir@/zfs-env-bootfs.service

		mkdir -p "${initdir}/$systemdsystemunitdir/initrd.target.wants"
		dracut_install @systemdunitdir@/zfs-import.target
		if ! [ -L "${initdir}/$systemdsystemunitdir/initrd.target.wants"/zfs-import.target ]; then
			ln -s ../zfs-import.target "${initdir}/$systemdsystemunitdir/initrd.target.wants"/zfs-import.target
			type mark_hostonly >/dev/null 2>&1 && mark_hostonly @systemdunitdir@/zfs-import.target
		fi

		for _service in zfs-snapshot-bootfs.service zfs-rollback-bootfs.service ; do
			inst "${moddir}/$_service" "${systemdsystemunitdir}/$_service"
			if ! [ -L "${initdir}/$systemdsystemunitdir/initrd.target.wants/$_service" ]; then
				ln -s "../$_service" "${initdir}/$systemdsystemunitdir/initrd.target.wants/$_service"
			fi
		done

		# There isn't a pkg-config variable for this,
		# and dracut doesn't automatically resolve anything this'd be next to
		local systemdsystemenvironmentgeneratordir
		systemdsystemenvironmentgeneratordir="$(pkg-config --variable=prefix systemd || echo "/usr")/lib/systemd/system-environment-generators"
		mkdir -p "${initdir}/${systemdsystemenvironmentgeneratordir}"
		inst "${moddir}"/import-opts-generator.sh "${systemdsystemenvironmentgeneratordir}"/zfs-import-opts.sh
	fi
}