More flake fixes

hm/rebuild/default.nix

@@ -0,0 +1,38 @@
+{ pkgs, config, ... }:
+let
+  ulf = pkgs.writers.writePython3 "update-local-flakes" {
+  } (builtins.readFile ./update-local-flakes.py);
+in
+{
+  home.packages = [
+    (pkgs.writeShellApplication {
+      name = "rb";
+      runtimeInputs = [ pkgs.brightnessctl ];
+      text = ''
+        verb="switch"
+        if [ "$#" -ge 1 ]
+        then
+          verb="$1"
+          shift
+        fi
+        nixos_flake="/etc/nixos/flake.nix"
+        if [ -f "$nixos_flake" ]
+        then
+          sudo ${ulf} "$nixos_flake"
+          if [ "$verb" = "switch" ] || [ "$verb" = "test" ]
+          then
+            sudo nixos-rebuild "$verb" --specialisation ${config.frogeye.polarity} "$@"
+          else
+            sudo nixos-rebuild "$verb" "$@"
+          fi
+        fi
+        hm_flake="${config.xdg.configHome}/home-manager/flake.nix"
+        if [ -f "$hm_flake" ]
+        then
+          ${ulf} "$hm_flake"
+          home-manager "$verb" "$@"
+        fi
+      '';
+    })
+  ];
+}