nixpkgs/nixos/modules/services/networking/tvheadend.nix

{ config, lib, pkgs, ... }:

with lib;

let cfg     = config.services.tvheadend;
    pidFile = "${config.users.users.tvheadend.home}/tvheadend.pid";
in

{
  options = {
    services.tvheadend = {
      enable = mkEnableOption (lib.mdDoc "Tvheadend");
      httpPort = mkOption {
        type        = types.int;
        default     = 9981;
        description = lib.mdDoc "Port to bind HTTP to.";
      };

      htspPort = mkOption {
        type        = types.int;
        default     = 9982;
        description = lib.mdDoc "Port to bind HTSP to.";
      };
    };
  };

  config = mkIf cfg.enable {
    users.users.tvheadend = {
      description = "Tvheadend Service user";
      home        = "/var/lib/tvheadend";
      createHome  = true;
      isSystemUser = true;
      group = "tvheadend";
    };
    users.groups.tvheadend = {};

    systemd.services.tvheadend = {
      description = "Tvheadend TV streaming server";
      wantedBy    = [ "multi-user.target" ];
      after       = [ "network.target" ];

      serviceConfig = {
        Type         = "forking";
        PIDFile      = pidFile;
        Restart      = "always";
        RestartSec   = 5;
        User         = "tvheadend";
        Group        = "video";
        ExecStart    = ''
                       ${pkgs.tvheadend}/bin/tvheadend \
                       --http_port ${toString cfg.httpPort} \
                       --htsp_port ${toString cfg.htspPort} \
                       -f \
                       -C \
                       -p ${pidFile} \
                       -u tvheadend \
                       -g video
                       '';
        ExecStop     = "${pkgs.coreutils}/bin/rm ${pidFile}";
      };
    };
  };
}