build bedrock under player

init.lua

local bedrock_timer = 1
minetest.register_globalstep(function(dtime)
	bedrock_timer = bedrock_timer - dtime
	if bedrock_timer > 0 then return end
	for k,player in ipairs(minetest.get_connected_players()) do
		bedrock_timer = 1
		local pos = player:getpos()

		if pos.y < -1 then
			player:setpos({x=pos.x,y=3,z=pos.z})
		end

		if (pos.y<2) then
			if minetest.env:get_node({x=pos.x,y=-1,z=pos.z}).name == "air" then
				for x=-2,2 do
				for z=-2,2 do
					minetest.env:set_node({x=pos.x+x,y=-1,z=pos.z+z}, {name="super_flat:bedrock"})
				end
				end
			end
		end
		
	end
end)