Represent remote machines as flake.

desktop/flake.nix

@@ -10,13 +10,11 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
   };
 
-  outputs = { self, nixpkgs, home-manager, bootstrap, ... }:
+  outputs = { nixpkgs, home-manager, bootstrap, ... }:
     let
       system = "x86_64-linux";
     in
     {
-      # Used with `nixos-rebuild --flake .#<hostname>`
-      # nixosConfigurations."<hostname>".config.system.build.toplevel must be a derivation
       nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
         inherit system;
         # Modules can be attribute sets or a function that returns an attribute set.

digital-ocean/flake.nix

@@ -15,8 +15,7 @@
         ];
         system.stateVersion = "23.11";
       };
-    in
-    {
+    in {
       packages.${system}.default = (pkgs.nixos module).digitalOceanImage;
     };
 }

hive/flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1701802827,
-        "narHash": "sha256-wTn0lpV75Uv6tU6haEypNsmnJJPb0hpaMIy/4uf5AiQ=",
+        "lastModified": 1701952659,
+        "narHash": "sha256-TJv2srXt6fYPUjxgLAL0cy4nuf1OZD4KuA1TrCiQqg0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a804fc878d7ba1558b960b4c64b0903da426ac41",
+        "rev": "b4372c4924d9182034066c823df76d6eaf1f4ec4",
         "type": "github"
       },
       "original": {
@@ -16,9 +16,27 @@
         "type": "github"
       }
     },
+    "phobos": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1,
+        "narHash": "sha256-D7vDC0Qph0MikxxgIlCNduD1o7QfQQO5SRtGLAVwywg=",
+        "path": "./phobos",
+        "type": "path"
+      },
+      "original": {
+        "path": "./phobos",
+        "type": "path"
+      }
+    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "phobos": "phobos"
       }
     }
   },

hive/flake.nix

@@ -2,20 +2,23 @@
   description = "Configuration of all remote NixOS machines.";
 
   inputs = {
+    phobos = {
+      url = "path:./phobos";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
   };
 
-  outputs = { nixpkgs, ... }:
-    {
-      colmena = {
-        meta = {
-          nixpkgs = import nixpkgs {
-            system = "x86_64-linux";
-          };
+  outputs = { nixpkgs, phobos, ... }: {
+    colmena = {
+      meta = {
+        nixpkgs = import nixpkgs {
+          system = "x86_64-linux";
         };
-
-        # Remote machines
-        phobos = (import ./phobos.nix);
       };
+
+      # Remote machines
+      phobos = phobos.nixosModules.default;
     };
+  };
 }

hive/phobos.nix

@@ -1,12 +0,0 @@
-{ modulesPath, lib, ... }:
-{
-  imports = lib.optional (builtins.pathExists ./do-userdata.nix) ./do-userdata.nix ++ [
-    (modulesPath + "/virtualisation/digital-ocean-config.nix")
-  ];
-
-  deployment.targetHost = "146.190.127.180";
-
-  networking.hostName = "phobos";
-
-  system.stateVersion = "23.11";
-}

hive/phobos/flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1701615100,
+        "narHash": "sha256-7VI84NGBvlCTduw2aHLVB62NvCiZUlALLqBe5v684Aw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e9f06adb793d1cca5384907b3b8a4071d5d7cb19",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

hive/phobos/flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "Phobos machine";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+  };
+
+  outputs = { nixpkgs, ... }: {
+    nixosModules.default = { modulesPath, lib, ... }: {
+      imports = lib.optional (builtins.pathExists ./do-userdata.nix) ./do-userdata.nix ++ [
+        (modulesPath + "/virtualisation/digital-ocean-config.nix")
+      ];
+
+      deployment.targetHost = "146.190.127.180";
+
+      networking.hostName = "phobos";
+
+      system.stateVersion = "23.11";
+    };
+  };
+}