systemd-initrd-swraid.nix

import ./make-test-python.nix (
  { lib, pkgs, ... }:
  {
    name = "systemd-initrd-swraid";

    nodes.machine =
      { pkgs, ... }:
      {
        # Use systemd-boot
        virtualisation = {
          emptyDiskImages = [
            512
            512
          ];
          useBootLoader = true;
          # Booting off the RAID requires an available init script
          mountHostNixStore = true;
          useEFIBoot = true;
        };
        boot.loader.systemd-boot.enable = true;
        boot.loader.efi.canTouchEfiVariables = true;

        environment.systemPackages = with pkgs; [
          mdadm
          e2fsprogs
        ]; # for mdadm and mkfs.ext4
        boot.swraid = {
          enable = true;
          mdadmConf = ''
            ARRAY /dev/md0 devices=/dev/vdb,/dev/vdc
          '';
        };
        environment.etc."mdadm.conf".text = ''
          MAILADDR test@example.com
        '';
        boot.initrd = {
          systemd = {
            enable = true;
            emergencyAccess = true;
          };
          kernelModules = [ "raid0" ];
        };

        specialisation.boot-swraid.configuration.virtualisation.rootDevice = "/dev/disk/by-label/testraid";
        # This protects against a regression. We do not have to switch to it.
        # It's sufficient to trigger its evaluation.
        specialisation.build-old-initrd.configuration.boot.initrd.systemd.enable = lib.mkForce false;
      };

    testScript = ''
      # Create RAID
      machine.succeed("mdadm --create --force /dev/md0 -n 2 --level=raid1 /dev/vdb /dev/vdc --metadata=0.90")
      machine.succeed("mkfs.ext4 -L testraid /dev/md0")
      machine.succeed("mkdir -p /mnt && mount /dev/md0 /mnt && echo hello > /mnt/test && umount /mnt")

      # Boot from the RAID
      machine.succeed("bootctl set-default nixos-generation-1-specialisation-boot-swraid.conf")
      machine.succeed("sync")
      machine.crash()
      machine.wait_for_unit("multi-user.target")

      # Ensure we have successfully booted from the RAID
      assert "(initrd)" in machine.succeed("systemd-analyze")  # booted with systemd in stage 1
      assert "/dev/md0 on / type ext4" in machine.succeed("mount")
      assert "hello" in machine.succeed("cat /test")
      assert "md0" in machine.succeed("cat /proc/mdstat")

      expected_config = """MAILADDR test@example.com

      ARRAY /dev/md0 devices=/dev/vdb,/dev/vdc
      """
      got_config = machine.execute("cat /etc/mdadm.conf")[1]
      assert expected_config == got_config, repr((expected_config, got_config))
      machine.wait_for_unit("mdmonitor.service")
    '';
  }
)