pass null in favor of recursion

Signed-off-by: Kiara Grouwstra <kiara@procolix.eu>

deployment/fediversity/ssh-hosts.nix

@@ -17,7 +17,7 @@ let
   sshOpts = [ ];
 in
 (pkgs.callPackage ../utils.nix { }).evalModel (
-  { config, modulesPath, ... }:
+  { config, ... }:
   {
     imports = [
       ./resources
@@ -59,7 +59,7 @@ in
       ) host-mapping;
     config = lib.mkMerge [
       {
-        environments = lib.mapAttrs (app: host: environment: {
+        environments = lib.mapAttrs (app: host: {
           resources =
             {
               "external".garage = { };
@@ -71,29 +71,12 @@ in
             }) host-mapping;
           implementation =
             {
-              required-resources,
               deployment-name,
               ...
             }:
-            let
-              garage = environment.config.resources."external".garage.process required-resources;
-              relevant-resources = lib.getAttrs [ app ] required-resources;
-            in
             {
               # try and use `ssh-host` since as of writing there is no plural variant
               ssh-host = {
-                nixos-configuration = {
-                  imports =
-                    [
-                      ../../infra/common/nixos
-                      "${sources.disko}/module.nix"
-                      "${modulesPath}/profiles/qemu-guest.nix"
-                      (environment.config.resources.${app}.network.process relevant-resources)
-                      (environment.config.resources."age".secrets.process relevant-resources)
-                    ]
-                    ++ (environment.config.resources."fediversity".nixos-module.process relevant-resources)
-                    ++ garage.applicationSide;
-                };
                 inherit system;
                 ssh = {
                   username = "root";
@@ -115,6 +98,7 @@ in
                     };
                   };
                 };
+                # omitting `nixos-configuration` as it's instead passed thru recursion's `ssh-host`
               };
             };
         }) host-mapping;

deployment/run/default.nix

@@ -66,6 +66,7 @@ let
   nixos-configuration = mkOption {
     description = "A NixOS configuration.";
     type = types.unspecified;
+    default = { };
   };
   # FIXME ensure this works from outside this repo too
   caller = mkOption {