nixpkgs/nixos/tests/systemd-initrd-btrfs-raid.nix

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

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

    environment.systemPackages = with pkgs; [ btrfs-progs ];
    boot.initrd.systemd = {
      enable = true;
      emergencyAccess = true;
    };

    specialisation.boot-btrfs-raid.configuration = {
      fileSystems = lib.mkVMOverride {
        "/".fsType = lib.mkForce "btrfs";
      };
      virtualisation.rootDevice = "/dev/vdb";
    };
  };

  testScript = ''
    # Create RAID
    machine.succeed("mkfs.btrfs -d raid0 /dev/vdb /dev/vdc")
    machine.succeed("mkdir -p /mnt && mount /dev/vdb /mnt && echo hello > /mnt/test && umount /mnt")

    # Boot from the RAID
    machine.succeed("bootctl set-default nixos-generation-1-specialisation-boot-btrfs-raid.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/vdb on / type btrfs" in machine.succeed("mount")
    assert "hello" in machine.succeed("cat /test")
    assert "Total devices 2" in machine.succeed("btrfs filesystem show")
  '';
})