home: move hmActivationPackages to own output

Fixes `nix flake check` failure.

flake.nix

@@ -97,19 +97,16 @@
             pkgImport nixos overlays system;
 
           packages =
-            let
-              packages' = flattenTreeSystem system
+            flattenTreeSystem system
               (genPackages {
                 inherit self pkgs;
               });
 
-              homeActivationPackages = genHomeActivationPackages
-                self.homeConfigurations;
-            in
-            recursiveUpdate packages' homeActivationPackages;
         in
         {
           inherit packages;
+          hmActivationPackages = genHomeActivationPackages
+            self.homeConfigurations;
 
           devShell = import ./shell {
             inherit pkgs nixos;

lib/default.nix

@@ -73,14 +73,12 @@ in
       (recursiveUpdate cachixAttrs modulesAttrs)
       profilesAttrs;
 
-  genHomeActivationPackages = hmConfigs: {
-    hmActivationPackages =
-      builtins.mapAttrs
-        (_: x: builtins.mapAttrs
+  genHomeActivationPackages = hmConfigs:
+    mapAttrs
+      (_: x: mapAttrs
         (_: cfg: cfg.home.activationPackage)
         x)
       hmConfigs;
-  };
 
   genPackages = { self, pkgs }:
     let

shell/default.nix

@@ -11,6 +11,9 @@ let
   }).config.system.build;
 
   flk = pkgs.writeShellScriptBin "flk" ''
+    system=$(nix eval --impure --expr "builtins.currentSystem")
+    system=${"\${system//\\\"/"}}
+
     if [[ -z "$1" ]]; then
       echo "Usage: $(basename "$0") [ iso | up | install {host} | {host} [switch|boot|test] | home {host} {user} [switch] ]"
     elif [[ "$1" == "up" ]]; then
@@ -28,7 +31,7 @@ let
     elif [[ "$1" == "install" ]]; then
       sudo nixos-install --flake "$DEVSHELL_ROOT#$2" "${"\${@:3}"}"
     elif [[ "$1" == "home" ]]; then
-      nix build ./#hmActivationPackages.$2.$3
+      nix build ./#hmActivationPackages."$system".$2.$3 "${"\${@:4}"}"
       if [[ "$4" == "switch" ]]; then
         ./result/activate && unlink result
       fi