nixos/dnscrypt-proxy2: add `package` option (#411451)

- `services.clamsmtp` is unmaintained and was removed from Nixpkgs.

- `services.dnscrypt-proxy2` gains a `package` option to specify dnscrypt-proxy package to use.

- `amdgpu` kernel driver overdrive mode can now be enabled by setting [hardware.amdgpu.overdrive.enable](#opt-hardware.amdgpu.overdrive.enable) and customized through [hardware.amdgpu.overdrive.ppfeaturemask](#opt-hardware.amdgpu.overdrive.ppfeaturemask).

  This allows for fine-grained control over the GPU's performance and maybe required by overclocking softwares like Corectrl and Lact. These new options replace old options such as {option}`programs.corectrl.gpuOverclock.enable` and {option}`programs.tuxclocker.enableAMD`.

  pkgs,

  ...

}:

with lib;

let

  cfg = config.services.dnscrypt-proxy2;

in

{

  options.services.dnscrypt-proxy2 = {

    enable = mkEnableOption "dnscrypt-proxy2";

    enable = lib.mkEnableOption "dnscrypt-proxy2";

    package = lib.mkPackageOption pkgs "dnscrypt-proxy" { };

    settings = mkOption {

    settings = lib.mkOption {

      description = ''

        Attrset that is converted and passed as TOML config file.

        For available params, see: <https://github.com/DNSCrypt/dnscrypt-proxy/blob/${pkgs.dnscrypt-proxy.version}/dnscrypt-proxy/example-dnscrypt-proxy.toml>

      '';

      example = literalExpression ''

      example = lib.literalExpression ''

        {

          sources.public-resolvers = {

            urls = [ "https://download.dnscrypt.info/resolvers-list/v2/public-resolvers.md" ];

          };

        }

      '';

      type = types.attrs;

      type = lib.types.attrs;

      default = { };

    };

    upstreamDefaults = mkOption {

    upstreamDefaults = lib.mkOption {

      description = ''

        Whether to base the config declared in {option}`services.dnscrypt-proxy2.settings` on the upstream example config (<https://github.com/DNSCrypt/dnscrypt-proxy/blob/master/dnscrypt-proxy/example-dnscrypt-proxy.toml>)

        Disable this if you want to declare your dnscrypt config from scratch.

      '';

      type = types.bool;

      type = lib.types.bool;

      default = true;

    };

    configFile = mkOption {

    configFile = lib.mkOption {

      description = ''

        Path to TOML config file. See: <https://github.com/DNSCrypt/dnscrypt-proxy/blob/master/dnscrypt-proxy/example-dnscrypt-proxy.toml>

        If this option is set, it will override any configuration done in options.services.dnscrypt-proxy2.settings.

      '';

      example = "/etc/dnscrypt-proxy/dnscrypt-proxy.toml";

      type = types.path;

      type = lib.types.path;

      default =

        pkgs.runCommand "dnscrypt-proxy.toml"

          {

            }

            ${pkgs.buildPackages.remarshal}/bin/json2toml < config.json > $out

          '';

      defaultText = literalMD "TOML file generated from {option}`services.dnscrypt-proxy2.settings`";

      defaultText = lib.literalMD "TOML file generated from {option}`services.dnscrypt-proxy2.settings`";

    };

  };

  config = mkIf cfg.enable {

  config = lib.mkIf cfg.enable {

    networking.nameservers = lib.mkDefault [ "127.0.0.1" ];

        AmbientCapabilities = "CAP_NET_BIND_SERVICE";

        CacheDirectory = "dnscrypt-proxy";

        DynamicUser = true;

        ExecStart = "${pkgs.dnscrypt-proxy}/bin/dnscrypt-proxy -config ${cfg.configFile}";

        ExecStart = "${lib.getExe cfg.package} -config ${cfg.configFile}";

        LockPersonality = true;

        LogsDirectory = "dnscrypt-proxy";

        MemoryDenyWriteExecute = true;