Motivation for this change

This is just a initial work, this is not done I just want to keep this as a placeholder, to be clear that I am working on something! :)

This allows for configs such as:

{ pkgs, config, ... }:

{
  services = {
    mautrix.services = {
      "facebook" = {
        package = pkgs.mautrix-facebook;
        settings = {
          appservice = {
            hostname = "127.0.0.1";
            port = 8493;
          };
          homeserver = {
            address = "http://127.0.0.1:8008";
            domain = "example.com";
          };
        };
      };
    };

    matrix-synapse = {
      enable = true;
      server_name = "example.com";

      app_service_config_files = (pkgs.lib.forEach 
        (builtins.attrNames config.services.mautrix.services)
        (name: config.services.mautrix.registrationDir+"/"+name+".yaml")
      );
    };
  };
}

This service will currently

• Start the preStartExec script as root
• Generate registration.yaml (for use with the homeserver)
• Generate registration.env (to automatically source before running the mautrix instance)
• Copy over registration.yaml to registrationDir, i.e. /var/lib/mautrix-registration/name.yaml
• Run the database migration stuff
• ExecStart will then source registration.env. and then run the appservice.

This module would also remove the previous module for telegram, or rewrite it to use this as the base module for it, as to not duplicate code.

TODO

• Maybe add mautrix-go support ?

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.