Fix apk check in openmptcprouter wizard interface

Author: Ysurac

luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm

@@ -10,13 +10,15 @@
 	local ifaces = sys.net:devices()
 	local ifttyu = nixio.fs.glob("/dev/ttyUSB*")
 	local ifttyc = nixio.fs.glob("/dev/cdc-wdm*")
-	local sqm = luci.sys.exec("opkg list-installed | grep -q luci-app-sqm && echo -n '1' || echo -n '0'")
-	if sqm == "0" then
-		sqm = luci.sys.exec("apk list | grep installed | grep -q luci-app-sqm && echo -n '1' || echo -n '0'")
+	if nixio.fs.stat('/usr/bin/apk', 'type') == 'reg' then
+		sqm = luci.sys.exec("apk list 2>/dev/null | grep installed | grep -q luci-app-sqm && echo -n '1' || echo -n '0'")
+	else
+		sqm = luci.sys.exec("opkg list-installed | grep -q luci-app-sqm && echo -n '1' || echo -n '0'")
 	end
-	local qos = luci.sys.exec("opkg list-installed | grep -q luci-app-qos && echo -n '1' || echo -n '0'")
-	if qos == "0" then
-		qos = luci.sys.exec("apk list | grep installed | grep -q luci-app-qos && echo -n '1' || echo -n '0'")
+	if nixio.fs.stat('/usr/bin/apk', 'type') == 'reg' then
+		qos = luci.sys.exec("apk list 2>/dev/null | grep installed | grep -q luci-app-qos && echo -n '1' || echo -n '0'")
+	else
+		qos = luci.sys.exec("opkg list-installed | grep -q luci-app-qos && echo -n '1' || echo -n '0'")
 	end
 	menuentry = uci:get("openmptcprouter","settings","menu") or "openmptcprouter"
 	function device_notvirtual(dev)