udp2raw-tunnel: iptables is an optional dependency (https://github.com/pentoo/pentoo-overlay/issues/500)

net-vpn/udp2raw-tunnel/files/udp2raw-daemon.initd

@@ -25,39 +25,9 @@ retry="${UDP2RAW_TERMTIMEOUT}"
 extra_commands="checkconfig"
 
 depend() {
-	need iptables
 	before net
 }
 
-_gen_ipt_rule() {
-	echo $(${UDP2RAW_BINARY} -g --conf-file "${UDP2RAW_CONFIGFILE}" \
-		| grep -oE "^iptables -I (.*) -j DROP$" \
-		| awk 'FS=" "{$1="";$2=""; print}')
-}
-
-_update_ipt_rule() {
-	local rule command=${1}
-	local ipt_binary=$(which iptables)
-
-	if [[ "${UDP2RAW_IPT_DISABLED}" == "1" ]]; then
-		return
-	fi
-
-	ebegin "Updating iptables rules"
-	if [ -n "${UDP2RAW_IPT_CMDLINE}" ]; then
-		einfo "Using custom rule: ${UDP2RAW_IPT_CMDLINE}"
-		rule="${UDP2RAW_IPT_CMDLINE}"
-	else
-		rule=$(_gen_ipt_rule)
-	fi
-
-	case ${command} in
-		add) ${ipt_binary} -t filter -C ${rule} > /dev/null 2>&1 || ${ipt_binary} -t filter -I ${rule} > /dev/null 2>&1;;
-		del) ${ipt_binary} -t filter -D ${rule} > /dev/null 2>&1;;
-	esac
-	eend ${?} "Failed to update a iptables rules"
-}
-
 checkconfig() {
 	if ! [ -f "${UDP2RAW_CONFIGFILE}" ] ; then
 		eerror "You need an /etc/udp2raw/*.conf file to run udp2raw"
@@ -75,11 +45,6 @@ checkconfig() {
 
 start_pre() {
 	checkconfig || return 1
-	_update_ipt_rule add
-}
-
-stop_post() {
-	_update_ipt_rule del
 }
 
 # vim: set ft=gentoo-init-d ts=4 :

net-vpn/udp2raw-tunnel/files/udp2raw-daemon.iptables.initd

@@ -0,0 +1,85 @@
+#!/sbin/openrc-run
+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+UDP2RAW_BINARY="${UDP2RAW_BINARY:-/usr/bin/udp2raw}"
+UDP2RAW_LOGFILE="${UDP2RAW_LOGFILE:-/var/log/udp2raw.log}"
+UDP2RAW_PIDFILE="${UDP2RAW_PIDFILE:-/run/${RC_SVCNAME}.pid}"
+UDP2RAW_TERMTIMEOUT="${UDP2RAW_TERMTIMEOUT:-"TERM/25/KILL/5"}"
+
+USER="nobody"
+GROUP="nobody"
+
+description="A tunnel which turns UDP Traffic into encrypted FakeTCP/UDP/ICMP traffic"
+command="${UDP2RAW_BINARY}"
+command_background=true
+command_user="${USER}:${GROUP}"
+command_args="
+	--conf-file ${UDP2RAW_CONFIGFILE}
+	${UDP2RAW_OPTS}"
+
+pidfile="${UDP2RAW_PIDFILE}"
+start_stop_daemon_args="--quiet -1 ${UDP2RAW_LOGFILE}"
+retry="${UDP2RAW_TERMTIMEOUT}"
+
+extra_commands="checkconfig"
+
+depend() {
+	need iptables
+	before net
+}
+
+_gen_ipt_rule() {
+	echo $(${UDP2RAW_BINARY} -g --conf-file "${UDP2RAW_CONFIGFILE}" \
+		| grep -oE "^iptables -I (.*) -j DROP$" \
+		| awk 'FS=" "{$1="";$2=""; print}')
+}
+
+_update_ipt_rule() {
+	local rule command=${1}
+	local ipt_binary=$(which iptables)
+
+	if [[ "${UDP2RAW_IPT_DISABLED}" == "1" ]]; then
+		return
+	fi
+
+	ebegin "Updating iptables rules"
+	if [ -n "${UDP2RAW_IPT_CMDLINE}" ]; then
+		einfo "Using custom rule: ${UDP2RAW_IPT_CMDLINE}"
+		rule="${UDP2RAW_IPT_CMDLINE}"
+	else
+		rule=$(_gen_ipt_rule)
+	fi
+
+	case ${command} in
+		add) ${ipt_binary} -t filter -C ${rule} > /dev/null 2>&1 || ${ipt_binary} -t filter -I ${rule} > /dev/null 2>&1;;
+		del) ${ipt_binary} -t filter -D ${rule} > /dev/null 2>&1;;
+	esac
+	eend ${?} "Failed to update a iptables rules"
+}
+
+checkconfig() {
+	if ! [ -f "${UDP2RAW_CONFIGFILE}" ] ; then
+		eerror "You need an /etc/udp2raw/*.conf file to run udp2raw"
+		eerror "There is a sample file in /usr/share/doc/udp2raw-tunnel-*"
+		return 1
+	fi
+
+	if ! [ -f "${UDP2RAW_LOGFILE}" ]; then
+		touch "${UDP2RAW_LOGFILE}" \
+			&& chmod 0660 "${UDP2RAW_LOGFILE}" > /dev/null 2>&1 \
+			&& chown ${USER}:${GROUP} "${UDP2RAW_LOGFILE}" > /dev/null 2>&1 \
+			|| eerror "Failed to create: ${UDP2RAW_LOGFILE}"
+	fi
+}
+
+start_pre() {
+	checkconfig || return 1
+	_update_ipt_rule add
+}
+
+stop_post() {
+	_update_ipt_rule del
+}
+
+# vim: set ft=gentoo-init-d ts=4 :

net-vpn/udp2raw-tunnel/metadata.xml

@@ -5,4 +5,7 @@
 		<email>email@linxon.ru</email>
 		<name>Yury Martynov</name>
 	</maintainer>
+	<use>
+		<flag name="iptables">include support for iptables filtering</flag>
+	</use>
 </pkgmetadata>

net-vpn/udp2raw-tunnel/udp2raw-tunnel-99999999.ebuild

@@ -16,11 +16,11 @@ fi
 
 LICENSE="MIT"
 SLOT="0"
-IUSE="cpu_flags_x86_aes doc"
+IUSE="cpu_flags_x86_aes doc iptables"
 
 DEPEND=""
 RDEPEND="${DEPEND}
-	net-firewall/iptables"
+	iptables? ( net-firewall/iptables )"
 
 src_prepare() {
 	# Disable optimisation flags and remove prefixes of exec files
@@ -30,7 +30,7 @@ src_prepare() {
 		-e "s/\${cc_[a-zA-Z0-9_]*}/$(tc-getCXX)/" \
 		-i makefile || die 'sed failed!'
 
-	eapply_user
+	default
 }
 
 src_compile() {
@@ -49,15 +49,18 @@ src_install() {
 	fperms 750 "/etc/${exec_name}"
 	doins example.conf
 
-	newinitd "${FILESDIR}"/udp2raw-daemon.initd udp2raw-daemon
+	newinitd "${FILESDIR}"/udp2raw-daemon$(use iptables && echo '.iptables').initd udp2raw-daemon
 	newconfd "${FILESDIR}"/udp2raw-daemon.confd udp2raw-daemon
 
-	insinto /etc/logrotate.d
+	insinto "/etc/logrotate.d"
 	newins "${FILESDIR}"/udp2raw-daemon.logrotated udp2raw-daemon
 
-	dodoc -r $(use doc && echo 'images doc/*') README.md example.conf Dockerfile
+	dobin $exec_name
+
 	doman "${FILESDIR}"/man/udp2raw.1
-	dobin ${exec_name}
+	dodoc -r \
+		$(use doc && echo 'images doc/*') \
+		README.md example.conf Dockerfile
 }
 
 pkg_postinst() {