Recursively include inputs for all inputs in disko closure.

nix/configuration/flake.nix

@@ -117,6 +117,40 @@
           ];
         }
       ) nodes;
+      installerConfig =
+        hostname: nodeConfig:
+        nixpkgs.lib.nixosSystem {
+          specialArgs = {
+            targetSystem = self.nixosConfigurations."${hostname}";
+          };
+          modules = [
+            ./formats/installer.nix
+            (
+              {
+                config,
+                lib,
+                pkgs,
+                ...
+              }:
+              let
+                repl_path = toString ./.;
+                nix-self-repl = pkgs.writeShellScriptBin "nix-self-repl" ''
+                  source /etc/set-environment
+                  nix repl "${repl_path}/repl.nix" "$@"
+                '';
+                # If we wanted the current version of a flake then we'd just launch
+                #   nix repl
+                # and then run:
+                #   :lf /path/to/flake
+              in
+              {
+                config = {
+                  environment.systemPackages = lib.mkIf config.nix.enable [ nix-self-repl ];
+                };
+              }
+            )
+          ];
+        };
     in
     {
       nixosConfigurations = (builtins.mapAttrs (name: value: value "toplevel") nixosConfigs);
@@ -129,6 +163,7 @@
             iso = (nixosConfigs."${hostname}" "iso").config.system.build.isoImage;
             vm_iso = (nixosConfigs."${hostname}" "vm_iso").config.system.build.isoImage;
             sd = (nixosConfigs."${hostname}" "sd").config.system.build.sdImage;
+            installer = (installerConfig hostname nodes."${hostname}").config.system.build.isoImage;
           }) (nixpkgs.lib.attrsets.filterAttrs (hostname: nodeConfig: nodeConfig.system == system) nodes))
         )
       );