quarry can not dig some nodes

- mcl_core:bedrock
- mcl_core:barrier
- df_underworld_items:slade
- df_underworld_items:slade_brick
- df_underworld_items:slade_wall
- df_underworld_items:slade_sand
- df_underworld_items:slade_block
- df_underworld_items:slade_seal

technic/machines/HV/quarry.lua

@@ -12,6 +12,17 @@ local quarry_time_limit = technic.config:get_int("quarry_time_limit")
 local quarry_demand = 10000
 local network_time_limit = 30000
 
+technic.unbreakable_nodes = {
+	"mcl_core:bedrock",
+	"mcl_core:barrier",
+	"df_underworld_items:slade",
+	"df_underworld_items:slade_brick",
+	"df_underworld_items:slade_wall",
+	"df_underworld_items:slade_sand",
+	"df_underworld_items:slade_block",
+	"df_underworld_items:slade_seal",
+}
+
 local infotext
 do
 	local name = S("@1 Quarry", S("HV"))
@@ -81,6 +92,11 @@ local function can_dig_node(pos, dig_pos, node_name, owner, digger)
 	if not def or not def.diggable or (def.can_dig and not def.can_dig(dig_pos, digger)) then
 		return false
 	end
+	for _, v in pairs(technic.unbreakable_nodes) do
+		if node_name == v then
+			return false
+		end
+	end
 	return not minetest.is_protected(dig_pos, owner)
 end