netifyd: support uci parameters

Integrate with uci to support 'enabled/disabled' startup option and
override netify's default auto network selection.

config netifyd
       option enabled 0
       option autoconfig 1

autoconfig: Use netify's in-built interface selection
else use 'internal/external_if' definitions.

Also persist important agent config across sysupgrade
agent.uuid, serial.uuid, site.uuid

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

net/netifyd/files/netifyd.init

@@ -9,20 +9,38 @@ STOP=50
 
 USE_PROCD=1
 PROG=/usr/sbin/netifyd
-NETIFYD_AUTODETECT=yes
+
+start_netifyd() {
+	local instance enabled autoconfig internal_if external_if
+
+	instance="$1"
+
+	config_get_bool enabled "$instance" enabled 0
+	[ "$enabled" -eq 0 ] && return 0
+
+	[ ! -d /var/run/netifyd ] && mkdir -p /var/run/netifyd
+
+	config_get_bool autoconfig "$instance" autoconfig 1
+
+	if [ "$autoconfig" -gt 0 ] ; then
+		source /usr/share/netifyd/functions.sh
+		load_modules
+		NETIFYD_AUTODETECT=yes
+		NETIFYD_OPTS=$(auto_detect_options)
+	else
+		config_get internal_if "$instance" internal_if "eth0"
+		config_get external_if "$instance" external_if "eth1"
+		NETIFYD_OPTS="-E $external_if -I $internal_if"
+	fi
+
+	procd_open_instance
+	procd_set_param command $PROG -R $NETIFYD_OPTS
+	procd_set_param file /etc/netifyd.conf
+	procd_set_param respawn
+	procd_close_instance
+}
 
 start_service() {
-    mkdir -p /etc/netify.d
-    mkdir -p /var/run/netifyd
-
-    source /usr/share/netifyd/functions.sh
-    NETIFYD_OPTS=$(auto_detect_options)
-
-    load_modules
-
-    procd_open_instance
-    procd_set_param command $PROG -R $NETIFYD_OPTS
-    procd_set_param file /etc/netifyd.conf
-    procd_set_param respawn
-    procd_close_instance
+	config_load netifyd
+	config_foreach start_netifyd netifyd
 }