nixos/tests/appliance-repart-image: fix (#466659)

      # Set NIX_DISK_IMAGE so that the qemu script finds the right disk image.

      os.environ['NIX_DISK_IMAGE'] = tmp_disk_image.name

      with subtest("/etc/os-release contains the right fileds"):

        os_release = machine.succeed("cat /etc/os-release")

      assert 'IMAGE_ID="${imageId}"' in os_release

      assert 'IMAGE_VERSION="${imageVersion}"' in os_release

        t.assertIn('IMAGE_ID="${imageId}"', os_release)

        t.assertIn('IMAGE_VERSION="${imageVersion}"', os_release)

      with subtest("Bootctl reports the right boot loader type"):

        bootctl_status = machine.succeed("bootctl status")

      assert "Boot Loader Specification Type #2 (.efi)" in bootctl_status

        print(bootctl_status)

        t.assertIn("Boot Loader Specification Type #2", bootctl_status)

    '';

}