Migrate update to own package

home.nix

@@ -36,6 +36,7 @@
     pkgs.dmenu
     pkgs.networkmanager_dmenu
     pkgs.dmenu-custom-scripts
+    pkgs.custom-update-system
     pkgs.dunst
     pkgs.st
     pkgs.ncdu

overlays/custom-update-system/default.nix

@@ -0,0 +1,21 @@
+self: super:
+
+{
+  custom-update-system = super.pkgs.writeShellApplication {
+    name = "custom-update-system";
+
+    runtimeInputs = [
+      super.pkgs.nix
+      super.pkgs.home-manager
+    ];
+
+    text = ''
+      nix-channel --update
+      home-manager switch
+      home-manager expire-generations '-30 days'
+      nix-env --delete-generations +5
+      nix store gc
+      nix store optimise
+    '';
+  };
+}

readme.md

@@ -65,19 +65,8 @@ It has the following sub folder:
 Update
 ------
 
-The following will update the whole system and clean things up:
-
-    nix-channel --update \
-       && home-manager switch \
-       && home-manager expire-generations '-30 days' \
-       && nix-env --delete-generations +5 \
-       && nix store gc \
-       && nix store optimise
-
-This will update the channel (fetch state of nixpkgs).
-It then will update system.
-Delete old generations.
-And run garbage collection.
+Update can be done via `custom-update-system` package which is available within
+the overlay.
 
 Manual changes
 --------------