nixos/tests: add squashfs test

        assert "erofs" in file_contents

      '';

    };

  squashfs =

    let

      fsImage = "/tmp/non-default-filesystem.img";

    in

    makeTest {

      name = "non-default-filesystems-squashfs";

      meta.maintainers = with maintainers; [ nikstur ];

      nodes.machine = {

        virtualisation.qemu.drives = [{

          name = "non-default-filesystem";

          file = fsImage;

          deviceExtraOpts.serial = "non-default";

        }];

        virtualisation.fileSystems."/non-default" = {

          device = "/dev/disk/by-id/virtio-non-default";

          fsType = "squashfs";

          neededForBoot = true;

        };

      };

      testScript = ''

        import subprocess

        with open("filesystem", "w") as f:

          f.write("squashfs")

        subprocess.run([

          "${pkgs.squashfsTools}/bin/mksquashfs",

          "filesystem",

          "${fsImage}",

        ])

        assert "squashfs" in machine.succeed("cat /non-default/filesystem")

      '';

    };

}