{ lib, config, nixpkgs, pkgs, ... }:

let
  pkg1 = pkgs.go;
in

{
  name = "fsync";

  nodes.machine =
    { config, lib, pkgs, ... }:
    { virtualisation.emptyDiskImages = [ 1024 ];
      environment.systemPackages = [ pkg1 ];
      nix.settings.experimental-features = [ "nix-command" ];
      nix.settings.fsync-store-paths = true;
      nix.settings.require-sigs = false;
      boot.supportedFilesystems = [ "ext4" "btrfs" "xfs" ];
    };

  testScript = { nodes }: ''
    # fmt: off
    for fs in ("ext4", "btrfs", "xfs"):
      machine.succeed("mkfs.{} {} /dev/vdb".format(fs, "-F" if fs == "ext4" else "-f"))
      machine.succeed("mkdir -p /mnt")
      machine.succeed("mount /dev/vdb /mnt")
      machine.succeed("sync")
      machine.succeed("nix copy --offline ${pkg1} --to /mnt")
      machine.crash()

      machine.start()
      machine.wait_for_unit("multi-user.target")
      machine.succeed("mkdir -p /mnt")
      machine.succeed("mount /dev/vdb /mnt")
      machine.succeed("nix path-info --offline --store /mnt ${pkg1}")
      machine.succeed("nix store verify --all --store /mnt --no-trust")

      machine.succeed("umount /dev/vdb")
  '';
}