From 3919c7abb6a1b46c9ccb63d1eed0d7c70cf10837 Mon Sep 17 00:00:00 2001
From: Daniel Siepmann <coding@daniel-siepmann.de>
Date: Fri, 11 Nov 2022 14:08:34 +0100
Subject: [PATCH] Add nixos update command

---
 home/packages.nix                             |  1 +
 .../custom/update-nixos-system/default.nix    | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 home/packages/custom/update-nixos-system/default.nix

diff --git a/home/packages.nix b/home/packages.nix
index a15eaa1..730350f 100644
--- a/home/packages.nix
+++ b/home/packages.nix
@@ -14,6 +14,7 @@ with pkgs; [
   # TODO: Create one `./packages/custom/default.nix which includes all other?
   (callPackage ./packages/custom/dmenu-scripts { })
   (callPackage ./packages/custom/update-system { })
+  (callPackage ./packages/custom/update-nixos-system { })
   (callPackage ./packages/custom/update-ubuntu-system { })
   (callPackage ./packages/custom/push-etckeeper { })
   (callPackage ./packages/custom/backup { })
diff --git a/home/packages/custom/update-nixos-system/default.nix b/home/packages/custom/update-nixos-system/default.nix
new file mode 100644
index 0000000..6eaadda
--- /dev/null
+++ b/home/packages/custom/update-nixos-system/default.nix
@@ -0,0 +1,19 @@
+{ writeShellApplication }:
+
+writeShellApplication {
+  name = "custom-update-nixos-system";
+
+  # Including this doesn't work
+
+  text = ''
+    sudo nixos-rebuild switch --upgrade-all
+
+    # shellcheck disable=SC2010
+    oldVersion=$(ls -vr /nix/var/nix/profiles/ | grep system | head -n 2 | tail -n 1)
+    nvd diff "/nix/var/nix/profiles/$oldVersion" "/nix/var/nix/profiles/system"
+
+    sudo nix-env -p /nix/var/nix/profiles/system --delete-generations +5
+    nix store gc
+    nix store optimise
+  '';
+}