nixos/stage-1-systemd: Add a test for LUKS keyfiles

nixos/tests/all-tests.nix

@@ -524,6 +524,7 @@ in
   systemd-confinement = handleTest ./systemd-confinement.nix {};
   systemd-cryptenroll = handleTest ./systemd-cryptenroll.nix {};
   systemd-escaping = handleTest ./systemd-escaping.nix {};
+  systemd-initrd-luks-keyfile = handleTest ./systemd-initrd-luks-keyfile.nix {};
   systemd-initrd-luks-password = handleTest ./systemd-initrd-luks-password.nix {};
   systemd-initrd-shutdown = handleTest ./systemd-shutdown.nix { systemdStage1 = true; };
   systemd-initrd-simple = handleTest ./systemd-initrd-simple.nix {};

nixos/tests/systemd-initrd-luks-keyfile.nix

@@ -0,0 +1,53 @@
+import ./make-test-python.nix ({ lib, pkgs, ... }: let
+
+  keyfile = pkgs.writeText "luks-keyfile" ''
+    MIGHAoGBAJ4rGTSo/ldyjQypd0kuS7k2OSsmQYzMH6TNj3nQ/vIUjDn7fqa3slt2
+    gV6EK3TmTbGc4tzC1v4SWx2m+2Bjdtn4Fs4wiBwn1lbRdC6i5ZYCqasTWIntWn+6
+    FllUkMD5oqjOR/YcboxG8Z3B5sJuvTP9llsF+gnuveWih9dpbBr7AgEC
+  '';
+
+in {
+  name = "systemd-initrd-luks-keyfile";
+
+  nodes.machine = { pkgs, ... }: {
+    # Use systemd-boot
+    virtualisation = {
+      emptyDiskImages = [ 512 ];
+      useBootLoader = true;
+      useEFIBoot = true;
+    };
+    boot.loader.systemd-boot.enable = true;
+
+    environment.systemPackages = with pkgs; [ cryptsetup ];
+    boot.initrd.systemd = {
+      enable = true;
+      emergencyAccess = true;
+    };
+
+    specialisation.boot-luks.configuration = {
+      boot.initrd.luks.devices = lib.mkVMOverride {
+        cryptroot = {
+          device = "/dev/vdc";
+          keyFile = "/etc/cryptroot.key";
+        };
+      };
+      virtualisation.bootDevice = "/dev/mapper/cryptroot";
+      boot.initrd.systemd.contents."/etc/cryptroot.key".source = keyfile;
+    };
+  };
+
+  testScript = ''
+    # Create encrypted volume
+    machine.wait_for_unit("multi-user.target")
+    machine.succeed("cryptsetup luksFormat -q --iter-time=1 -d ${keyfile} /dev/vdc")
+
+    # Boot from the encrypted disk
+    machine.succeed("bootctl set-default nixos-generation-1-specialisation-boot-luks.conf")
+    machine.succeed("sync")
+    machine.crash()
+
+    # Boot and decrypt the disk
+    machine.wait_for_unit("multi-user.target")
+    assert "/dev/mapper/cryptroot on / type ext4" in machine.succeed("mount")
+  '';
+})