infra/nix/home-manager/programs/gpg-agent.nix

{
  lib,
  pkgs,
  config,
  ...
}: {
  home.packages =
    [
      pkgs.gcr
    ]
    ++ (
      if config.services.gpg-agent.pinentryFlavor == "gtk2"
      then [pkgs.pinentry-gtk2]
      else if config.services.gpg-agent.pinentryFlavor == "gnome3"
      then [pkgs.pinentry-gnome]
      else []
    );

  programs.gpg.enable = true;
  services.gpg-agent = {
    enable = true;
    enableScDaemon = true;
    enableSshSupport = true;
    grabKeyboardAndMouse = true;
    pinentryFlavor = lib.mkDefault "gtk2";
    extraConfig = "";

    defaultCacheTtl = 0;
    maxCacheTtl = 0;
  };
}