machine_setup/nix/configuration/roles/gpg/default.nix

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

let
  gpg_test_wkd =
    (pkgs.writeScriptBin "gpg_test_wkd" (builtins.readFile ./files/gpg_test_wkd.bash)).overrideAttrs
      (old: {
        buildCommand = "${old.buildCommand}\n patchShebangs $out";

      });
in
{
  imports = [ ];

  # Fetch public keys:
  # gpg --locate-keys tom@fizz.buzz
  #
  # gpg -vvv --auto-key-locate local,wkd --locate-keys tom@fizz.buzz

  hardware.gpgSmartcards.enable = true;
  services.udev.packages = [
    pkgs.yubikey-personalization
    pkgs.libfido2
    (pkgs.writeTextFile {
      name = "my-rules";
      text = ''
        ACTION=="add", SUBSYSTEM=="usb", ENV{ID_VENDOR_ID}=="1050", ENV{ID_MODEL_ID}=="0406", MODE="660", GROUP="wheel"
        KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="1050", ATTRS{idProduct}=="0406", TAG+="uaccess", GROUP="wheel", MODE="0660"
      '';
      destination = "/etc/udev/rules.d/50-yubikey.rules";
    })
  ];
  services.pcscd.enable = true;
  # services.gnome.gnome-keyring.enable = true;

  # services.dbus.packages = [ pkgs.gcr ];

  # services.pcscd.plugins = lib.mkForce [ ];

  #   programs.gpg.scdaemonSettings = {
  #   disable-ccid = true;
  # };

  # .gnupg/scdaemon.conf
  home-manager.users.talexander =
    { pkgs, ... }:
    {
      home.file.".gnupg/scdaemon.conf" = {
        source = ./files/scdaemon.conf;
      };
    };

  # programs.gnupg.dirmngr.enable = true;
  programs.gnupg.agent = {
    enable = true;
    enableSSHSupport = true;
    pinentryPackage = pkgs.pinentry-qt;
    # settings = {
    #   disable-ccid = true;
    # };
  };

  environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
    hideMounts = true;
    users.talexander = {
      directories = [
        {
          directory = ".gnupg";
          user = "talexander";
          group = "talexander";
          mode = "0700";
        } # Local keyring
      ];
    };
  };

  nixpkgs.overlays = [
    (final: prev: {
      # pcsclite = prev.pcsclite.overrideAttrs (old: {
      #   postPatch = ''
      #     substituteInPlace src/libredirect.c src/spy/libpcscspy.c \
      #       --replace-fail "libpcsclite_real.so.1" "$lib/lib/libpcsclite_real.so.1"
      #   '';
      # });

      # pcsclite = prev.pcsclite.overrideAttrs (old: {
      #   postPatch =
      #     old.postPatch
      #     + (lib.optionalString
      #       (!(lib.strings.hasInfix ''--replace-fail "libpcsclite_real.so.1"'' old.postPatch))
      #       ''
      #         substituteInPlace src/libredirect.c src/spy/libpcscspy.c \
      #           --replace-fail "libpcsclite_real.so.1" "$lib/lib/libpcsclite_real.so.1"
      #       ''
      #     );
      # });

      # pcsclite = prev.pcsclite.overrideAttrs (old: {
      #   postPatch =
      #     old.postPatch
      #     + ''
      #       substituteInPlace src/libredirect.c src/spy/libpcscspy.c \
      #         --replace-fail "libpcsclite_real.so.1" "$lib/lib/libpcsclite_real.so.1"
      #     '';
      # });

      # gnupg = prev.gnupg.override {
      #   pcsclite = pkgs.pcsclite.overrideAttrs (old: {
      #     postPatch =
      #       old.postPatch
      #       + (lib.optionalString
      #         (!(lib.strings.hasInfix ''--replace-fail "libpcsclite_real.so.1"'' old.postPatch))
      #         ''
      #           substituteInPlace src/libredirect.c src/spy/libpcscspy.c \
      #             --replace-fail "libpcsclite_real.so.1" "$lib/lib/libpcsclite_real.so.1"
      #         ''
      #       );
      #   });
      # };
    })
  ];

  # security.polkit.extraConfig = ''
  #   polkit.addRule(function(action, subject) {
  #     if (action.id == "org.debian.pcsc-lite.access_card") {
  #       return polkit.Result.YES;
  #     }
  #   });

  #   polkit.addRule(function(action, subject) {
  #     if (action.id == "org.debian.pcsc-lite.access_pcsc") {
  #       return polkit.Result.YES;
  #     }
  #   });
  # '';

  environment.systemPackages = with pkgs; [
    pcsclite
    pcsctools
    yubikey-personalization
    yubikey-manager
    glibcLocales
    ccid
    libusb-compat-0_1
    gpg_test_wkd
  ];

  # nixpkgs.overlays = [
  #   (final: prev: {
  #     gnupg = pkgs-unstable.gnupg;
  #     scdaemon = pkgs-unstable.scdaemon;
  #     libgcrypt = pkgs-unstable.libgcrypt;
  #   })
  # ];

  # nixpkgs.overlays = [
  #   (final: prev: {
  #     gnupg = prev.gnupg.overrideAttrs (old: rec {
  #       version = "2.4.7";
  #       src = prev.fetchurl {
  #         url = "https://www.gnupg.org/ftp/gcrypt/gnupg/gnupg-${version}.tar.bz2";
  #         hash = "sha256-eyRwbk2n4OOwbKBoIxAnQB8jgQLEHJCWMTSdzDuF60Y=";
  #       };
  #     });
  #   })
  # ];

  programs.gnupg.agent.enableExtraSocket = true;
}