nix - 如何在Nixos配置中覆盖2个(两个)软件包

Question

我的configuration.nix中有一些要覆盖的软件包。因此，我将代码编写如下:

nixpkgs.config = {
  allowUnfree = true;
  packageOverrides = {
    pkgs: rec {
      #mumble + pulse audio
      mumble = pkgs.mumble.override {
        pulseSupport = true;
      };

      #kernel for intel ethernet and Testing e1000e package override
      linuxPackages.e1000e = pkgs.linuxPackages.e1000e.overrideDerivation (attrs: {
        name = "e1000e-3.3.3-${config.boot.kernelPackages.kernel.version}";
        src = fetchurl {
          url = "https://www.dropbox.com/s/pxx883hx9763ygn/e1000e-3.3.3.tar.gz?dl=0";
          sha256 = "1s2w54927fsxg0f037h31g3qkajgn5jd0x3yi1chxsyckrcr0x80";
        };
      });
    };
  };
};

但是当我执行 nixos-rebuild switch时，出现以下错误:

syntax error, unexpected ':', expecting '.' or '=', at 37,11

这是在 pkgs: rec {...我做错什么了？首先，我通过如下分离pkg来编写它:

packageOverrides = {
  pkgs: with pkgs: {......}; #this is for mumble
  pkgs: rec {...}; #this is for kernel
};

仍然出现相同的错误。

Answer 1

正确的解决方案是:

nixpkgs.config = {

  allowUnfree = true;

  packageOverrides = super: let self = super.pkgs; in {

    mumble = super.mumble.override { pulseSupport = true; };

    linuxPackages = super.linuxPackages // {
      e1000e = super.linuxPackages.e1000e.overrideDerivation (old: {
        name = "e1000e-3.3.3-${config.boot.kernelPackages.kernel.version}";
        src = fetchurl {
          url = "https://www.dropbox.com/s/pxx883hx9763ygn/e1000e-3.3.3.tar.gz?dl=0";
          sha256 = "1s2w54927fsxg0f037h31g3qkajgn5jd0x3yi1chxsyckrcr0x80";
        };
      });
    };
  };
}

变量 super引用应用覆盖之前的Nixpkgs集，而 self引用应用覆盖之后的Nixpkgs集。重要的是要明确区分这两个，以避免无限递归等。

另外，请注意，您的替代

linuxPackages.e1000e = pkgs.linuxPackages.e1000e.overrideDerivation ...

将 linuxPackages属性集替换为除(overrided) e1000e派生类外不含任何属性。那可能不是您想要的。