Add support for runit

X-Gentoo-Bug: 501364
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=501364

init.d/Makefile

@@ -3,7 +3,8 @@ include ../mk/net.mk
 DIR=	${INITDIR}
 SRCS=	bootmisc.in fsck.in hostname.in local.in localmount.in loopback.in \
 	netmount.in osclock.in root.in savecache.in swap.in swapfiles.in \
-	tmpfiles.setup.in swclock.in sysctl.in urandom.in s6-svscan.in ${SRCS-${OS}}
+	tmpfiles.setup.in swclock.in sysctl.in runsvdir.in urandom.in \
+	s6-svscan.in ${SRCS-${OS}}
 BIN=	${OBJS}
 
 # Are we installing our network scripts?

init.d/runsvdir.in

@@ -0,0 +1,20 @@
+#!@SBINDIR@/openrc-run
+# Copyright (c) 2016 The OpenRC Authors.
+# See the Authors file at the top-level directory of this distribution and
+# https://github.com/OpenRC/openrc/blob/master/AUTHORS
+#
+# This file is part of OpenRC. It is subject to the license terms in
+# the LICENSE file found in the top-level directory of this
+# distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
+# This file may not be copied, modified, propagated, or distributed
+# except according to the terms contained in the LICENSE file.
+
+command=/usr/bin/runsvdir
+command_background=yes
+pidfile=/var/run/runsvdir.pid
+command_args="-P $RC_SVCDIR/sv 'log: ...........................................................................................................................................................................................................................................................................................................................................................................................................'"
+
+start_pre()
+{
+	checkpath -m 0755 -o root:root -d ${RC_SVCDIR}/sv
+}

runit-guide.md

@@ -0,0 +1,41 @@
+# Using runit with OpenRC
+
+Beginning with OpenRC-0.21, we support using runit [1] in place of
+start-stop-daemon for monitoring and restarting daemons.
+
+## Setup
+
+Documenting runit in detail is beyond the scope of this guide. It will
+document how to set up OpenRC services to communicate with runit.
+
+### Use Default start, stop and status functions
+
+If you write your own start, stop and status functions in your service
+script, none of this will work. You must allow OpenRC to use the default
+functions.
+
+### Dependencies
+
+All OpenRC service scripts that want their daemons monitored by runit
+should have the following line added to their dependencies to make sure
+the runit scan directory is being monitored.
+
+need runsvdir
+
+### Variable Settings
+
+The most important setting is the supervisor variable. At the top of
+your service script, you should set this variable as follows:
+
+supervisor=runit
+
+The second variable you need is runit_service. This is the path to the
+runit service you wish to control via OpenRC. The default is
+/etc/sv/${RC_SVCNAME}. This means that for an OpenRC service
+/etc/init.d/foo, you will need to create the same runit service in
+/etc/sv/foo.
+
+This is very early support, so feel free to file bugs if you have
+issues.
+
+[1] http://www.smarden.org/runit

sh/Makefile

@@ -1,8 +1,8 @@
 DIR=	${LIBEXECDIR}/sh
 SRCS=	init.sh.in functions.sh.in gendepends.sh.in \
 	openrc-run.sh.in rc-functions.sh.in tmpfiles.sh.in ${SRCS-${OS}}
-INC=	functions.sh rc-mount.sh rc-functions.sh s6.sh start-stop-daemon.sh \
-		supervise-daemon.sh
+INC=	rc-mount.sh functions.sh rc-functions.sh runit.sh s6.sh \
+		start-stop-daemon.sh supervise-daemon.sh
 BIN=	gendepends.sh init.sh openrc-run.sh tmpfiles.sh ${BIN-${OS}}
 
 INSTALLAFTER=	_installafter

sh/openrc-run.sh.in

@@ -153,6 +153,7 @@ start()
 {
 	local func=ssd_start
 	case "$supervisor" in
+		runit) func=runit_start ;;
 		s6) func=s6_start ;;
 		supervise-daemon) func=supervise_start ;;
 		?*)
@@ -166,6 +167,7 @@ stop()
 {
 	local func=ssd_stop
 	case "$supervisor" in
+		runit) func=runit_stop ;;
 		s6) func=s6_stop ;;
 		supervise-daemon) func=supervise_stop ;;
 		?*)
@@ -179,6 +181,7 @@ status()
 {
 	local func=ssd_status
 	case "$supervisor" in
+		runit) func=runit_status ;;
 		s6) func=s6_status ;;
 		supervise-daemon) func=supervise_status ;;
 		?*)
@@ -216,6 +219,7 @@ fi
 
 
 # load service supervisor functions
+sourcex "@LIBEXECDIR@/sh/runit.sh"
 sourcex "@LIBEXECDIR@/sh/s6.sh"
 sourcex "@LIBEXECDIR@/sh/start-stop-daemon.sh"
 sourcex "@LIBEXECDIR@/sh/supervise-daemon.sh"

sh/runit.sh

@@ -0,0 +1,52 @@
+# Copyright (c) 2016 The OpenRC Authors.
+# See the Authors file at the top-level directory of this distribution and
+# https://github.com/OpenRC/openrc/blob/master/AUTHORS
+#
+# This file is part of OpenRC. It is subject to the license terms in
+# the LICENSE file found in the top-level directory of this
+# distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
+# This file may not be copied, modified, propagated, or distributed
+#    except according to the terms contained in the LICENSE file.
+# Released under the 2-clause BSD license.
+
+runit_start()
+{
+	local service_path service_link
+	service_path="${runit_service:-/etc/sv/${RC_SVCNAME}}"
+	if [ ! -d "${service_path}" ]; then
+		eerror "Runit service ${service_path} not found"
+		return 1
+	fi
+	service_link="${RC_SVCDIR}/sv/${service_path##*/}"
+	ebegin "Starting ${name:-$RC_SVCNAME}"
+	ln -snf "${service_path}" "${service_link}"
+	sv start "${service_link}" > /dev/null 2>&1
+	eend $? "Failed to start $RC_SVCNAME"
+}
+
+runit_stop()
+{
+	local service_path service_link
+	service_path="${runit_service:-/etc/sv/${RC_SVCNAME}}"
+	if [ ! -d "${service_path}" ]; then
+		eerror "Runit service ${service_path} not found"
+		return 1
+	fi
+	service_link="${RC_SVCDIR}/sv/${service_path##*/}"
+	ebegin "Stopping ${name:-$RC_SVCNAME}"
+	sv stop "${service_link}" > /dev/null 2>&1 &&
+	rm "${service_link}"
+	eend $? "Failed to stop $RC_SVCNAME"
+}
+
+runit_status()
+{
+	local service_path service_link
+	service_path="${runit_service:-/etc/sv/${RC_SVCNAME}}"
+	if [ ! -d "${service_path}" ]; then
+		eerror "Runit service ${service_path} not found"
+		return 1
+	fi
+	service_link="${RC_SVCDIR}/sv/${service_path##*/}"
+	sv status "${service_link}"
+}