如何在Nixos configuration.nix中覆盖2（两个）包

Question

我有一些包可以在我的configuration.nix中覆盖。所以我写的代码如下：

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"; 
     }; 
    }); 
    }; 
}; 

};

但是当我做nixos-rebuild switch，我得到了以下错误：

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

这是PKGS：REC {...

我做了什么错？起初，我通过这样分开pkgs来编写它：

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

并且仍然得到相同的错误。

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"; 
     }; 
     }); 
    }; 
    }; 
} 

可变super指Nixpkgs设置之前的替换值被应用，并且self是指它的替换值施加后。区分这两种明确，以避免无限递归等

也很重要，请注意您覆盖

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

替换linuxPackages属性与一个包含什么，但（重写）e1000e推导设置。这可能不是你想要的。