use nixpkgs from flakes and set configuration rev

briafzentrum.nix

@@ -26,10 +26,6 @@ with lib;
 
   nix.maxJobs = 3;
   nix.buildCores = 2;
-  nix.nixPath = mkForce [
-    "nixos-config=/dontuse"
-    "/nix/var/nix/profiles/per-user/root/channels"
-  ];
 
   services.openssh.enable = true;
 

flake.nix

@@ -6,7 +6,7 @@
     utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { nixpkgs, utils, ... }: let
+  outputs = { self, nixpkgs, utils, ... }: let
     supportedSystems = utils.lib.defaultSystems;
   in utils.lib.eachSystem supportedSystems (system: let
     pkgs = import nixpkgs { inherit system; };
@@ -33,6 +33,12 @@
         services.fail2ban.enable = true;
         zramSwap.enable = true;
         nixpkgs.system = "x86_64-linux";
+
+        # include git rev of this repo/flake into the nixos-version
+        system.configurationRevision = nixpkgs.lib.mkIf (self ? rev) self.rev;
+        # set nixpkgs flake of the target to the nixpkgs verion of the deployment
+        nix.registry.nixpkgs.flake = nixpkgs;
+        nix.nixPath = lib.mkForce [ "nixpkgs=${nixpkgs}" "nixos-config=/dontuse" ];
       };
 
       briafzentrum = { name, nodes, pkgs, ... }: {