nixos/systemd: fix socket `sshd-vsock`

      serviceConfig.ExecSearchPath = "${config.services.openssh.package}/bin";

      overrideStrategy = "asDropin";

    };

    # Fix paths in sshd-vsock.socket

    # https://github.com/systemd/systemd/blob/v259.3/src/ssh-generator/ssh-generator.c#L239

    # this socket is used, for example, when NixOS is started via systemd-vmspawn

    systemd.sockets.sshd-vsock = mkIf config.services.openssh.enable {

      overrideStrategy = "asDropin";

      socketConfig.ExecStartPost = [

        ""

        "${config.systemd.package}/lib/systemd/systemd-ssh-issue --make-vsock"

      ];

      socketConfig.ExecStopPre = [

        ""

        "${config.systemd.package}/lib/systemd/systemd-ssh-issue --rm-vsock"

      ];

    };

  };

  # FIXME: Remove these eventually.