keepalived: add enabled option

To prevent the keepalived service from starting if there is no valid
configuration yet, the new option enabled is added. This must be set to
true for keepalived to start.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/keepalived/files/keepalived.config

@@ -1,4 +1,5 @@
 config globals 'globals'
+	option enabled '0'
 #	option alt_config_file		"/etc/keepalived/keepalived.conf"
 #	list notification_email		"acassen@firewall.loc"
 #	list notification_email		"failover@firewall.loc"

net/keepalived/files/keepalived.init

@@ -600,7 +600,6 @@ process_config() {
 	local alt_config_file linkbeat_use_polling
 
 	rm -f "$KEEPALIVED_CONF"
-	[ -f /etc/config/keepalived ] || return 0
 	config_load 'keepalived'
 	config_get alt_config_file globals alt_config_file
 
@@ -654,14 +653,20 @@ reload_service() {
 }
 
 start_service() {
+	local enabled
+
+	[ -f /etc/config/keepalived ] || return 0
+
+	config_load 'keepalived'
+	config_get_bool enabled globals enabled 1
+	[ "$enabled" = "0" ] && return 0
+
+	process_config
+
 	procd_open_instance
 	procd_set_param command /usr/sbin/keepalived
 	procd_append_param command -n # don't daemonize, procd will handle that for us
 	procd_append_param command -f "$KEEPALIVED_CONF"
-
-	process_config
-
-	# set auto respawn behavior
 	procd_set_param respawn
 	procd_close_instance
 }