add support for control groups version 2

This is for #94.

sh/openrc-run.sh.in

@@ -258,8 +258,7 @@ for _cmd; do
 		[ -n "${rc_ulimit:-$RC_ULIMIT}" ] && \
 			ulimit ${rc_ulimit:-$RC_ULIMIT}
 		# Apply cgroups settings if defined
-		if [ "$(command -v cgroup_add_service)" = \
-		    "cgroup_add_service" ]
+		if [ "$(command -v cgroup_add_service)" = "cgroup_add_service" ]
 		then
 			if [ -d /sys/fs/cgroup -a ! -w /sys/fs/cgroup ]; then
 				eerror "No permission to apply cgroup settings"
@@ -268,9 +267,11 @@ for _cmd; do
 			cgroup_add_service /sys/fs/cgroup/openrc
 			cgroup_add_service /sys/fs/cgroup/systemd/system
 		fi
-		[ "$(command -v cgroup_set_limits)" = \
-		    "cgroup_set_limits" ] && \
-		    cgroup_set_limits
+		[ "$(command -v cgroup_set_limits)" = "cgroup_set_limits" ] &&
+			cgroup_set_limits
+		[ "$(command -v cgroup2_set_limits)" = "cgroup2_set_limits" ] &&
+			[ "$_cmd" = start ] &&
+			cgroup2_set_limits
 		break
 	fi
 done
@@ -368,6 +369,10 @@ while [ -n "$1" ]; do
 				"$1" = "stop" ] && \
 				yesno "${rc_cgroup_cleanup}" && \
 					cgroup_cleanup
+				if [ "$(command -v cgroup2_remove)" = "cgroup2_remove" ]; then
+					[ "$1" = stop ] || [ -z "${command}" ] &&
+					cgroup2_remove
+				fi
 				shift
 				continue 2
 			else