switch to nixpkgs hosteded by cache.nixos.org

take 2 on https://git.clan.lol/clan/clan-core/pulls/2921

checks/container/default.nix

@@ -1,7 +1,7 @@
 (import ../lib/container-test.nix) (
   { ... }:
   {
-    name = "secrets";
+    name = "container";
 
     nodes.machine =
       { ... }:

checks/installation/flake-module.nix

@@ -92,6 +92,7 @@
         self.nixosConfigurations.test-install-machine.config.system.build.toplevel
         self.nixosConfigurations.test-install-machine.config.system.build.diskoScript
         self.nixosConfigurations.test-install-machine.config.system.clan.deployment.file
+        pkgs.bash.drvPath
         pkgs.stdenv.drvPath
         pkgs.nixos-anywhere
         pkgs.bubblewrap

checks/lib/container-test.nix

@@ -16,6 +16,9 @@ in
       documentation.enable = lib.mkDefault false;
       boot.isContainer = true;
 
+      # needed since nixpkgs 7fb2f407c01b017737eafc26b065d7f56434a992 removed the getty unit by default
+      console.enable = true;
+
       # undo qemu stuff
       system.build.initialRamdisk = "";
       virtualisation.sharedDirectories = lib.mkForce { };

flake.lock

@@ -57,18 +57,14 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1739512841,
-        "narHash": "sha256-Zc+K4AxAwFaWKK18nSl/3TKidGf46En7bfK8SL+Revg=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "fada727ee7c0bd487e311dede0a2b0725a0f7765",
-        "type": "github"
+        "lastModified": 315532800,
+        "narHash": "sha256-hAlw8vSTDD0GuUWGdmA/Pj7N85b6tBGehLsu+qcZpFQ=",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixpkgs/nixpkgs-25.05pre759303.3a05eebede89/nixexprs.tar.xz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://nixos.org/channels/nixpkgs-unstable/nixexprs.tar.xz"
       }
     },
     "root": {

flake.nix

@@ -2,7 +2,7 @@
   description = "clan.lol base operating system";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    nixpkgs.url = "https://nixos.org/channels/nixpkgs-unstable/nixexprs.tar.xz";
 
     flake-parts.url = "github:hercules-ci/flake-parts";
     flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";

lib/build-clan/tests.nix

@@ -30,7 +30,7 @@ in
       expr = shallowForceAllAttributes config;
       expectedError = {
         type = "ThrownError";
-        msg = "A definition for option `directory' is not of type `path*";
+        msg = "A definition for option `directory' is not of type `absolute path*";
       };
     };