downgrade xz and switch to impure evaluation

config/default.nix

@@ -2,6 +2,7 @@
   config,
   pkgs,
   system,
+  nixpkgs-staging-next,
   ...
 }: {
   imports = [
@@ -79,4 +80,12 @@
     enable = true;
   };
   i18n.defaultLocale = "nl_NL.UTF-8";
+
+  # TODO: workaround for https://github.com/NixOS/nixpkgs/pull/300028
+  system.replaceRuntimeDependencies = [
+    {
+      original = pkgs.xz;
+      replacement = nixpkgs-staging-next.legacyPackages.${system}.xz;
+    }
+  ];
 }

config/nix.nix

@@ -163,7 +163,7 @@
     script = lib.mkDefault ''
       #!${pkgs.bash}/bin/bash
       set -ex
-      builds=$(${pkgs.curl}/bin/curl -H 'accept: application/json' https://hydra.int.chir.rs/jobset/flakes/nixos-config/evals | ${pkgs.jq}/bin/jq -r '.evals[0].builds[]')
+      builds=$(${pkgs.curl}/bin/curl -H 'accept: application/json' https://hydra.int.chir.rs/jobset/nixos-config/nixos-config/evals | ${pkgs.jq}/bin/jq -r '.evals[0].builds[]')
       for build in $builds; do
           doc=$(${pkgs.curl}/bin/curl -H 'accept: application/json' https://hydra.int.chir.rs/build/$build)
           jobname=$(echo $doc | ${pkgs.jq}/bin/jq -r '.job')

flake.lock

@@ -678,6 +678,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-staging-next": {
+      "locked": {
+        "lastModified": 1711778457,
+        "narHash": "sha256-L6uaSIPJyqOyaSY8VGdbhMyiaCKSdGDvmpQtVCMoYTo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "459f861224e8517134b4c5a104cf44aa0bd14c22",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "staging-next",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1711200738,
@@ -733,6 +749,7 @@
         "nixos-hardware": "nixos-hardware",
         "nixos-vscode-server": "nixos-vscode-server",
         "nixpkgs": "nixpkgs_3",
+        "nixpkgs-staging-next": "nixpkgs-staging-next",
         "rust-overlay": "rust-overlay",
         "sops-nix": "sops-nix",
         "systems": "systems_2"

flake.nix

@@ -111,6 +111,7 @@ rec {
       inputs.nixpkgs.follows = "nixpkgs";
     };
     nixpkgs.url = "github:NixOS/nixpkgs";
+    nixpkgs-staging-next.url = "github:NixOS/nixpkgs/staging-next";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.flake-utils.follows = "flake-utils";