Replace nixos-generators with upstream nixpkgs image support

flake.lock

@@ -260,42 +260,6 @@
         "type": "github"
       }
     },
-    "nixlib": {
-      "locked": {
-        "lastModified": 1736643958,
-        "narHash": "sha256-tmpqTSWVRJVhpvfSN9KXBvKEXplrwKnSZNAoNPf/S/s=",
-        "owner": "nix-community",
-        "repo": "nixpkgs.lib",
-        "rev": "1418bc28a52126761c02dd3d89b2d8ca0f521181",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nixpkgs.lib",
-        "type": "github"
-      }
-    },
-    "nixos-generators": {
-      "inputs": {
-        "nixlib": "nixlib",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1764234087,
-        "narHash": "sha256-NHF7QWa0ZPT8hsJrvijREW3+nifmF2rTXgS2v0tpcEA=",
-        "owner": "nix-community",
-        "repo": "nixos-generators",
-        "rev": "032a1878682fafe829edfcf5fdfad635a2efe748",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nixos-generators",
-        "type": "github"
-      }
-    },
     "nixos-hardware": {
       "locked": {
         "lastModified": 1767185284,
@@ -338,7 +302,6 @@
         "home-manager": "home-manager",
         "microvm": "microvm",
         "nix-index-database": "nix-index-database",
-        "nixos-generators": "nixos-generators",
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs",
         "simple-nixos-mailserver": "simple-nixos-mailserver",

flake.nix

@@ -3,11 +3,6 @@
     # nixpkgs
     nixpkgs.url = "github:NixOS/nixpkgs/master";
 
-    nixos-generators = {
-      url = "github:nix-community/nixos-generators";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-
     # Common Utils Among flake inputs
     systems.url = "github:nix-systems/default";
     flake-utils = {
@@ -149,26 +144,33 @@
         nixpkgs.lib.mapAttrs
           (hostname: cfg:
             mkSystem cfg.arch nixpkgs cfg.configurationPath hostname)
-          machineHosts;
+          machineHosts
-
+        //
-      packages =
+        (let
-        with inputs;
+          mkEphemeral = system: nixpkgs.lib.nixosSystem {
-        let
-          mkEphemeral = system: format: nixos-generators.nixosGenerate {
             inherit system;
-            inherit format;
             modules = [
               ./machines/ephemeral/minimal.nix
-              nix-index-database.nixosModules.default
+              inputs.nix-index-database.nixosModules.default
             ];
           };
-        in
+        in {
-        {
+          ephemeral-x86_64 = mkEphemeral "x86_64-linux";
-          "x86_64-linux".kexec = mkEphemeral "x86_64-linux" "kexec-bundle";
+          ephemeral-aarch64 = mkEphemeral "aarch64-linux";
-          "x86_64-linux".iso = mkEphemeral "x86_64-linux" "iso";
+        });
-          "aarch64-linux".kexec = mkEphemeral "aarch64-linux" "kexec-bundle";
+
-          "aarch64-linux".iso = mkEphemeral "aarch64-linux" "iso";
+      # kexec produces a tarball; for a self-extracting bundle see:
+      # https://github.com/nix-community/nixos-generators/blob/master/formats/kexec.nix#L60
+      packages = {
+        "x86_64-linux" = {
+          kexec = self.nixosConfigurations.ephemeral-x86_64.config.system.build.images.kexec;
+          iso = self.nixosConfigurations.ephemeral-x86_64.config.system.build.images.iso;
         };
+        "aarch64-linux" = {
+          kexec = self.nixosConfigurations.ephemeral-aarch64.config.system.build.images.kexec;
+          iso = self.nixosConfigurations.ephemeral-aarch64.config.system.build.images.iso;
+        };
+      };
 
       overlays.default = import ./overlays { inherit inputs; };
       nixosModules.kernel-modules = import ./overlays/kernel-modules;