From 9096fc6607a196f48df1da1dbe9b3f2b0908d76d Mon Sep 17 00:00:00 2001
From: Arpit Chakladar <arpitchakladar+git@gmail.com>
Date: Fri, 21 Aug 2026 03:59:06 +0530
Subject: 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
---
 modules/scripts/nix-update/script.sh | 110 +++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 modules/scripts/nix-update/script.sh

(limited to 'modules/scripts/nix-update/script.sh')

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
-- 
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