I’m a long time user of KeePass 2 password manager, even so it is actually a Windows .NET application, that runs on Mono. It has two feature that are important to me, that the KeePass for Linux lacks:

  • synchronize the underlying file on save (I share the .kdbx file using ownCloud), instead of just overwriting it (eliminating changes to the database from other hosts)
  • reference credentials from other entries

… and as I’m back on NixOS, I of course wanted to have KeePass with the KeePassHttp for Chromium integration. On Ubuntu installation is trivial, KeePass itself is packaged, you take the plugin’s .plgx file and put it (as root) next to the KeePass.exe file somewhere under /usr/share.

Oh well, /nix/store is read-only, hence different approach needed.

Turns out that keepass2 NixOS package already has a plugin field, which just is set to an empty list. Therefore once you got the syntax it’s pretty straight forward…

That’s what my /etc/nixos/configuration.nix file looks like (relevant parts):

{ config, pkgs, ... }:


  keepassWithPlugins = pkgs.keepass.override {
    plugins = [


  # ... primary part of configuration.nix goes here ...

  # List packages installed in system profile. To search by name, run:
  # $ nix-env -qaP | grep wget
  environment.systemPackages = with pkgs; [

    # ... other packages ...