Expose a NixOS configuration for each VM in infra

infra/flake-part.nix

@@ -5,8 +5,14 @@
 }:
 
 let
-  inherit (lib) attrValues concatLists mapAttrs;
-  inherit (lib.attrsets) genAttrs;
+  inherit (lib)
+    attrValues
+    concatLists
+    mapAttrs
+    mkOption
+    evalModules
+    ;
+  inherit (lib.attrsets) concatMapAttrs genAttrs;
 
   addDefaultDeployment =
     deployments: deployments // { default = concatLists (attrValues deployments); };
@@ -35,11 +41,39 @@ let
     }
   );
 
-in
-{
-  flake.lib.makeInstallerIso = import ./makeInstallerIso.nix;
+  nixops4ResourceNixosMockOptions = {
+    ## NOTE: We allow the use of a few options from
+    ## `inputs.nixops4-nixos.modules.nixops4Resource.nixos` such that we can
+    ## reuse modules that make use of them.
+    ##
+    ## REVIEW: We can probably do much better and cleaner. On the other hand,
+    ## this is only needed to expose NixOS configurations for provisioning
+    ## purposes, and eventually all of this should be handled by NixOps4.
+    options = {
+      nixos.module = mkOption { }; # NOTE: not just `nixos` otherwise merging will go wrong
+      nixpkgs = mkOption { };
+      ssh = mkOption { };
+    };
+  };
 
-  nixops4Deployments = makeDeployments (addDefaultDeployment {
+  makeConfigurations = concatMapAttrs (
+    _: vmNames:
+    genAttrs vmNames (
+      vmName:
+      inputs.nixpkgs.lib.nixosSystem {
+        modules = [
+          (evalModules {
+            modules = [
+              nixops4ResourceNixosMockOptions
+              (makeResourceModule vmName)
+            ];
+          }).config.nixos.module
+        ];
+      }
+    )
+  );
+
+  machines = {
     git = [
       "vm02116"
       "fedi300"
@@ -49,5 +83,12 @@ in
       "vm02179"
       "vm02186"
     ];
-  });
+  };
+
+in
+{
+  flake.lib.makeInstallerIso = import ./makeInstallerIso.nix;
+
+  nixops4Deployments = makeDeployments (addDefaultDeployment machines);
+  flake.nixosConfigurations = makeConfigurations machines;
 }