modules/by-name/sy/system_diff/module.nix


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# nixos-config - My current NixOS configuration
#
# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of my nixos-config.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
{
  config,
  lib,
  pkgs,
  ...
}: let
  cfg = config.soispha.services.systemDiff;
in {
  options.soispha.services.systemDiff = {
    enable = lib.mkEnableOption "nvd run at system activation";
  };

  config = lib.mkIf cfg.enable {
    system.activationScripts.diff = {
      supportsDryActivation = true;
      text = ''
        PATH="${lib.makeBinPath [pkgs.nvd config.nix.package]}:$PATH"

        if [ -e /run/current-system ]; then
          # ${lib.getExe config.nix.package} --extra-experimental-features nix-command store diff-closures /run/current-system "$systemConfig"
          nvd diff $(ls -dv /nix/var/nix/profiles/system-*-link | tail -2)
        fi
      '';
    };
  };
}