separated from webmail mod

migrate.lua

@@ -0,0 +1,24 @@
+
+-- migrate from mail.db to player-file-based mailbox
+
+mail.migrate = function()
+
+	local file = io.open(minetest.get_worldpath().."/mail.db", "r")
+	if file then
+		print("[mail] migrating to new per-player storage")
+		minetest.mkdir(mail.maildir)
+
+		local data = file:read("*a")
+		local oldmails = minetest.deserialize(data)
+		file:close()
+
+		for name, oldmessages in pairs(oldmails) do
+			mail.setMessages(name, oldmessages)
+		end
+
+		-- rename file
+		print("[mail] migration done, renaming old mail.db")
+		os.rename(minetest.get_worldpath().."/mail.db", minetest.get_worldpath().."/mail.db.old")
+	end
+
+end