feat: build a much more minimal config for installing

nix/hosts.nix

@@ -12,15 +12,15 @@ inputs: let
     ;
 
   # Creates a new nixosSystem with the correct specialArgs, pkgs and name definition
-  mkHost = name: system: let
-    pkgs = self.pkgs.${system};
+  mkHost = {minimal}: name: hostCfg: let
+    pkgs = self.pkgs.${hostCfg.system};
   in
     nixosSystem {
       specialArgs = {
         # Use the correct instance lib that has our overlays
         inherit (pkgs) lib;
         inherit (self) nodes;
-        inherit inputs;
+        inherit inputs minimal;
       };
       modules = [
         {
@@ -28,7 +28,7 @@ inputs: let
           # inputs.nixpkgs.nixosModules.readOnlyPkgs, since some nixosModules
           # like nixseparatedebuginfod depend on adding packages via nixpkgs.overlays.
           # So we just mimic the options and overlays defined by the passed pkgs set.
-          nixpkgs.hostPlatform = system;
+          nixpkgs.hostPlatform = hostCfg.system;
           nixpkgs.overlays = pkgs.overlays;
           nixpkgs.config = pkgs.config;
           node.name = name;
@@ -45,7 +45,8 @@ inputs: let
   # Get all hosts of type "nixos"
   nixosHosts = filterAttrs (_: x: x.type == "nixos") hosts;
   # Process each nixosHosts declaration and generatea nixosSystem definitions
-  nixosConfigurations = flip mapAttrs nixosHosts (name: hostCfg: mkHost name hostCfg.system);
+  nixosConfigurations = flip mapAttrs nixosHosts (mkHost {minimal = false;});
+  nixosConfigurationsMinimal = flip mapAttrs nixosHosts (mkHost {minimal = true;});
 
   # True NixOS nodes can define additional microvms (guest nodes) that are built
   # together with the true host. We collect all defined microvm nodes
@@ -59,5 +60,6 @@ in {
     hosts
     microvmConfigurations
     nixosConfigurations
+    nixosConfigurationsMinimal
     ;
 }