feat: add nix-update+nvd script

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1705408632,
-        "narHash": "sha256-/AhkReVocTli5BLWA5WXxUlGYXn3Agi/uzX76TNrsbo=",
+        "lastModified": 1705875991,
+        "narHash": "sha256-ssoo8WYXy4H0qQ81GhzOaMnvDmeXV02D4DdGOYRKCnU=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "37d6eeceee464adc03585404eebd68765b3c8615",
+        "rev": "0021558dba313b6f494cd16362dcd4071f407535",
         "type": "github"
       },
       "original": {
@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1705133751,
-        "narHash": "sha256-rCIsyE80jgiOU78gCWN3A0wE0tR2GI5nH6MlS+HaaSQ=",
+        "lastModified": 1705677747,
+        "narHash": "sha256-eyM3okYtMgYDgmYukoUzrmuoY4xl4FUujnsv/P6I/zI=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "9b19f5e77dd906cb52dade0b7bd280339d2a1f3d",
+        "rev": "bbe7d8f876fbbe7c959c90ba2ae2852220573261",
         "type": "github"
       },
       "original": {

modules/aliases.nix

@@ -17,7 +17,6 @@
   nec = "nvim --cmd \"cd $(readlink -f /etc/nixos)\"";
   ncc = "sudo nixos-rebuild switch --upgrade-all --flake \"$(readlink -f /etc/nixos)\"";
   nup = "sudo nix-channel --update";
-  nuf = "sudo nix flake update --nix-path /etc/nixos";
   ngc = "sudo nix-collect-garbage -d";
 
   dcup = "docker-compose up --detach --remove-orphans";

modules/nix.nix

@@ -1,8 +1,12 @@
-{ ... }: {
-  nix.settings = {
+{ pkgs, ... }: {
+  nix = {
+    # TODO remove once 24.05 is released
+    package = pkgs.nixVersions.unstable;
+    settings = {
       experimental-features = [ "nix-command" "flakes" ];
       auto-optimise-store = true;
     };
+  };
 
   nixpkgs.overlays = [
     (self: super: {

modules/packages.nix

@@ -14,6 +14,7 @@
     unzip
     libsecret
     xidel # xml parser
+    nvd # nix diff package versions between two store paths
   ] ++ lib.optionals (devenv.enable) [
     # languages
     gcc13

users/gandalf/modules/default.nix

@@ -8,6 +8,7 @@
     ./keyd.nix
     ./neovim
     ./packages.nix
+    ./scripts
     ./ssh.nix
     ./tmux.nix
     ./xdg.nix

users/gandalf/modules/scripts/default.nix

@@ -0,0 +1,5 @@
+{ pkgs, nixosConfig, ... }: {
+  home.packages = [
+    (import ./nix-update.nix { inherit pkgs nixosConfig; })
+  ];
+}

users/gandalf/modules/scripts/nix-update.nix

@@ -0,0 +1,35 @@
+{ pkgs, nixosConfig }:
+
+pkgs.writeShellScriptBin "nuf" ''
+  reset="\e[0m"
+  red="\e[31m"
+  green="\e[32m"
+  yellow="\e[33m"
+  white_bold="\e[1;37m"
+
+  function error {
+    echo ""
+    echo -e "''${red}>>>Error: $1''${reset}"
+    exit 1
+  }
+
+  FLAKE=$(readlink -f /etc/nixos)
+
+  echo -e "''${green}>>> Updating flake $FLAKE ...''${reset}"
+  ${nixosConfig.nix.package}/bin/nix flake update --flake "$FLAKE" || error "Updating failed"
+
+  cd $(mktemp -d)
+  echo ""
+  echo -e "''${green}>>> Building configuration ...''${reset}"
+  nixos-rebuild build --flake "$FLAKE" || error "Building failed"
+
+  echo ""
+  echo -e "''${green}>>> Running diff ...''${reset}";
+  ${pkgs.nvd}/bin/nvd diff /run/current-system result || error "Diff failed"
+
+  cd - > /dev/null
+
+  echo ""
+  echo -e "''${yellow}>>> The new configuration has not been activated.''${reset}"
+  echo -e "''${yellow}>>> Use ''${white_bold}nixos-rebuild switch''${reset}''${yellow} to activate.''${reset}"
+''