How to configure Mullvad GUI declaratively (Electron app)

[Grraahaam]

Hi folks!

Hope you’re doing fine!

TL;DR; I want to declaratively configure the mullvad-gui’s settings (~/.config/Mullvad VPN/gui_settinngs.json). Particularly the autoConnect and startMinimized keys.

I’ve already successfully configured the vpn daemon through nix, see below thread :

Help extending the 'mullvad-vpn' module for NixOS to include more configuration

The Issue I’m looking to extend the NixOS module for Mullvad VPN to be able to configure the Mullvad daemon settings, which it stores in /etc/mullvad-vpn/settings.json. It’s pretty straightforward to outline all of the available options in Nix format, and then use something like environment.etc."mullvad-vpn/settings.json".source with pkgs.formats.json.generate to turn that into an appropriate json file, but this approach has two issues: There is a section of the settings.json file called api…

I’ve tried several ways to achieve this, but none of them worked as expected, at least the way I did it. (e.g. writeShellScript + makeAutostartItem).

As for today the below opens the GUI on startup, but do not auto-connect… (as it’s not yet configured)

{ pkgs, ... }:
let
  mullvad-autostart = pkgs.makeAutostartItem {
    name = "mullvad-vpn";
    package = pkgs.mullvad-vpn;
  };
in
{
  environment.systemPackages = [ mullvad-autostart ];
}

I’m also using home-manager, and I’d like to only edit the above mentioned keys, and let the others be controlled by the service itself.

Should I create a service for it to autostart and provide my custom config? Any help is welcome

Cheers