Install nvd

home-manager/roles/default.nix

@@ -7,6 +7,7 @@
     ./unlock.nix
     ./mpclient.nix
     ./neovim
+    ./nvd.nix
   ];
   nixpkgs.overlays = import ../../overlays { inherit lib; };
 

home-manager/roles/nvd.nix

@@ -0,0 +1,9 @@
+{ config, pkgs, lib, ... }:
+with lib;
+let
+  dag = config.lib.dag;
+  nvd = import pkgs.sources.nvd { inherit pkgs; };
+in
+{
+  home.activation.report-changes = dag.entryAnywhere "${nvd}/bin/nvd $oldGenPath $newGenPath";
+}

lib/update-system.nix

@@ -1,9 +1,11 @@
 { pkgs, nixos-rebuild }:
-let configPath = "/etc/nixos";
-in {
+let
+  configPath = "/etc/nixos";
+in
+{
   update-system = pkgs.writeHaskellScript {
     name = "update-system";
-    bins = [ nixos-rebuild pkgs.nix-output-monitor ];
+    bins = [ nixos-rebuild pkgs.nix-output-monitor (import pkgs.sources.nvd { inherit pkgs; }) ];
   } ''
     main = do
         paths <- myNixPath "${configPath}"
@@ -11,6 +13,9 @@ in {
         setEnv "WITH_SECRETS" "false"
         nom_build (paths ++ buildSystemParams ++ ["--no-out-link"] ++ remoteBuildParams ++ fmap toString args)
         setEnv "WITH_SECRETS" "true"
+        oldSystem <- readlink "-f" "/run/current-system" |> captureTrim
         nixos_rebuild (paths ++ ["switch"] ++ fmap toString args) &!> StdOut |> nom
+        newSystem <- readlink "-f" "/run/current-system" |> captureTrim
+        nvd oldSystem newSystem
   '';
 }

nix/sources.json

@@ -99,6 +99,12 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/294d1925af6462e55c76b49624b983036f0093b9.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "nvd": {
+        "branch": "master",
+        "repo": "https://gitlab.com/khumba/nvd.git",
+        "rev": "7cdaa6d818119bd7a51930d990fded5d594c6623",
+        "type": "git"
+    },
     "obelisk": {
         "branch": "master",
         "description": "Obelisk provides an easy way to develop and deploy your Reflex project for web and mobile",