How to organize the update of the game files?

Question

JavaScript

There is a project, this is a game, it has its own launcher, it checks for updates using git, and so on. now I want to abandon this technology by making a repository on the server and checking it every time you click the play button. As I understand it, you need to make a hashmap of all files and then compare it with the hashmap of the client, do I understand correctly? Are there already written bikes, can you recommend something?