scripts: added nix-update script

- nix-update script can be used to automatically update both
  home-manager and nixos, either just update the flake inputs or
  recompute/rebuild the entire configuration with the updated
  derivations
- fixed fzf unknown option error that appeared in the newer versions

3 files changed, 136 insertions, 0 deletions

diff --git a/modules/scripts/default.nix b/modules/scripts/default.nix
index caa3af7..ae18329 100644
--- a/modules/scripts/default.nix
+++ b/modules/scripts/default.nix
@@ -8,6 +8,7 @@
     ./deep-clean
     ./gopass-ssh-load
     ./gpg-backup
+    ./nix-update
     ./neomutt-sync
     ./screen-recording
     ./system-monitor
diff --git a/modules/scripts/nix-update/default.nix b/modules/scripts/nix-update/default.nix
new file mode 100644
index 0000000..787265d
--- /dev/null
+++ b/modules/scripts/nix-update/default.nix
@@ -0,0 +1,25 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  inherit ((import ../lib.nix { inherit lib pkgs; })) mkScriptModule;
+  base = mkScriptModule {
+    name = "nix-update";
+    path = ./script.sh;
+    description = "Update NixOS and/or Home Manager flake configuration\nRuns nix flake update and rebuilds the system";
+    deps = [
+      pkgs.git
+      pkgs.nix
+      config.programs.home-manager.package
+      pkgs.bash
+    ];
+    inherit config;
+  };
+in
+{
+  options = base.options;
+  config = base.moduleConfig;
+}
diff --git a/modules/scripts/nix-update/script.sh b/modules/scripts/nix-update/script.sh
new file mode 100644
index 0000000..7f2b6d0
--- /dev/null
+++ b/modules/scripts/nix-update/script.sh
@@ -0,0 +1,110 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+HM_DIR="$HOME/.config/home-manager"
+NIXOS_DIR="/etc/nixos"
+FLAKE_ONLY=false
+TARGET=""
+
+usage() {
+  echo "Usage: nix-update <home-manager|nixos|both> [--flake-only]"
+  echo ""
+  echo "Options:"
+  echo "  home-manager   Update and switch home-manager configuration"
+  echo "  nixos          Update and switch NixOS configuration"
+  echo "  both           Update and switch both configurations"
+  echo ""
+  echo "Flags:"
+  echo "  --flake-only   Only run nix flake update, skip switch commands"
+  exit 1
+}
+
+parse_args() {
+  while [[ $# -gt 0 ]]; do
+    case "$1" in
+      home-manager | nixos | both)
+        if [[ -n "$TARGET" ]]; then
+          echo "Error: only one target allowed"
+          usage
+        fi
+        TARGET="$1"
+        shift
+        ;;
+      --flake-only)
+        FLAKE_ONLY=true
+        shift
+        ;;
+      -h | --help)
+        usage
+        ;;
+      *)
+        echo "Error: unknown option '$1'"
+        usage
+        ;;
+    esac
+  done
+
+  if [[ -z "$TARGET" ]]; then
+    echo "Error: no target specified"
+    usage
+  fi
+}
+
+update_home_manager() {
+  echo "==> Updating home-manager..."
+  cd "$HM_DIR"
+
+  echo "    Staging modules/private..."
+  git add modules/private -f
+
+  echo "    Running nix flake update..."
+  nix flake update
+
+  if [[ "$FLAKE_ONLY" == false ]]; then
+    echo "    Running home-manager switch..."
+    home-manager switch --flake "$HM_DIR#arpit"
+  fi
+
+  echo "    Unstaging modules/private..."
+  git rm --cached -r modules/private
+
+  echo "==> home-manager update complete"
+}
+
+update_nixos() {
+  echo "==> Updating NixOS..."
+  sudo -v
+  cd "$NIXOS_DIR"
+
+  echo "    Staging hardware-configuration.nix..."
+  git add hardware-configuration.nix -f
+
+  echo "    Running nix flake update..."
+  nix flake update
+
+  if [[ "$FLAKE_ONLY" == false ]]; then
+    echo "    Running nixos-rebuild switch..."
+    sudo nixos-rebuild switch
+  fi
+
+  echo "    Unstaging hardware-configuration.nix..."
+  git rm --cached hardware-configuration.nix
+
+  echo "==> NixOS update complete"
+}
+
+parse_args "$@"
+
+case "$TARGET" in
+  home-manager)
+    update_home_manager
+    ;;
+  nixos)
+    update_nixos
+    ;;
+  both)
+    update_nixos
+    update_home_manager
+    ;;
+esac