Protection fixes

- Work with new NC protection API for items
- Alarm only when protection provided by dais,
  not on other mods' protections

alarm.lua

@@ -9,6 +9,8 @@ local exmachina = nodecore[modname]
 local squelch = {}
 
 minetest.register_on_protection_violation(function(pos, name)
+		if not pos.alarm then return end
+
 		local gain = tonumber(minetest.settings:get(modname .. "_alarm")) or 1
 		if gain <= 0 then return end
 

mod.conf

@@ -1,3 +1,3 @@
 name = nc_exmachina
-depends = nc_api_all, nc_terrain, nc_tree
+depends = nc_api_all, nc_terrain, nc_tree, nc_items
 min_minetest_version = 5.3

protect.lua

@@ -6,8 +6,6 @@ local minetest, nodecore, pairs, rawset
 local modname = minetest.get_current_modname()
 local exmachina = nodecore[modname]
 
-local old_prot = minetest.is_protected
-
 local default = "group:metal_cube, group:tote"
 
 local grouppref = "group:"
@@ -29,19 +27,32 @@ local function check(pos, thingname, pname)
 	if minetest.check_player_privs(pname, "protection_bypass") then return end
 	if match(thingname) or match(nodecore.stack_get(pos):get_name()) then
 		local owned = exmachina.owner_search(pos)
-		if owned and owned ~= pname then return true end
+		if owned and owned ~= pname then
+			pos.alarm = true
+			return true
+		end
 	end
 end
-
 local placing
+local function metacheck(pos, name)
+	return check(pos, minetest.get_node(pos).name, name)
+	or (placing and check(pos, placing, name))
+end
 
 -- Check on trying to dig/access a protected node, and
 -- handle placement check from special cases.
+local old_prot = minetest.is_protected
 function minetest.is_protected(pos, name, ...)
-	if check(pos, minetest.get_node(pos).name, name)
-	or (placing and check(pos, placing, name)) then return true end
+	if metacheck(pos, minetest.get_node(pos).name, name) then return true end
 	return old_prot(pos, name, ...)
 end
+local old_exempt = nodecore.protection_exempt
+function nodecore.protection_exempt(pos, name, ...)
+	local old = old_exempt(pos, name, ...)
+	if not old then return old end
+	if metacheck(pos, minetest.get_node(pos).name, name) then return end
+	return old
+end
 
 -- Check on trying to place a protected node.
 local old_place = minetest.item_place_node