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{pkgs, config, lib, ...}: let 
  cfg = config.wilkuu.mjmap; 
  inherit (lib) mkEnableOption mkOption types mkIf;
  # TODO: Once the mjmap patch is upstreamed, use this. 
  #mjmap_wrap = (pkgs.writeScriptBin "mjmap" ''
  #  #! ${pkgs.bash}/bin/bash
  #  export MJMAP_CONFIG=${config.sops.secrets."mjmap-creds".path};
  #  exec ${pkgs.mjmap} "$@"
  # ''); 
  
  # Workaround since the current version does not support setting config path;
  mjmap_wrap = (pkgs.writeScriptBin "mjmap-send" ''
    #! ${pkgs.bash}/bin/bash
    export XDG_CONFIG_DIR=/etc/;
    exec ${pkgs.mjmap}/bin/mjmap "$@"
  ''); 

  sendmail_wrap = pkgs.symlinkJoin {
    name = "sendmail-wrapper";
    paths = [ mjmap_wrap ];
    postBuild = ''
      ln -s $out/bin/mjmap-send $out/bin/sendmail
    '';
  }; 

in {
  options.wilkuu.mjmap = {
    enable = mkEnableOption "mjmap jmap email"; 
    users  = mkOption {
      type = types.listOf types.str; 
      description = "users that are allowed to view the credentials file and thus use mjmail"; 
    };
  };

  config = mkIf cfg.enable{
    users.groups.mjmap = mkIf (cfg.users != []) {}; 
    users.users = lib.genAttrs cfg.users (_: {
      extraGroups = ["mjmap"];
      packages    = [mjmap_wrap sendmail_wrap];
    });
    sops.secrets."mjmap-creds" = mkIf (cfg.users != []) {
      sopsFile = ../secrets/${config.networking.hostName}/mjmap.scfg.bin; 
      key = ""; 
      format = "binary";
      group = "mjmap"; 
      mode  = "440"; 
    };
    environment.etc."mjmap/config.scfg" = mkIf (cfg.users != [])  { source = config.sops.secrets."mjmap-creds".path; }; 
    environment.systemPackages = [ pkgs.mjmap ];
  };  
}