[Nix-dev] Has someone a working setup for Kernel development with NixOS?

[Matthias Beyer]

Hi,

so here is what I've got so far... maybe my approach is nonsense, but 
I don't know that (yet... feel free to point me to a better one).

It doesn't work, though, as I get:

    error: value is a function while a set was expected

and I don't know why.

Here is my custom-kernel.nix. The imports are simply things which 
should be in a normal configuration.nix.

Maybe someone of you has a good idea how to get this working.

-------------8<-------------
{ config, pkgs, ... }:

let
  configDir = /home/m/config/nixos;
  nixpkgsClone = /home/m/dev/contrib/nixpkgs;

  kernelSrc     = "../linux/";
  kernelVersion = "4.7-custom";

	customKernelFn = 
		{ stdenv, fetchurl, perl, buildLinux, ... } @ args:
			import "${nixpkgsClone}/pkgs/os-specific/linux/kernel/generic.nix" (args // {
				version = kernelVersion;
				extraMeta.branch = "master";

				src = kernelSrc;
				kernelPatches = pkgs.kernelPatches;

				features.iwlwifi = true;
				features.efiBootStub = true;
				features.needsCifsUtils = true;
				features.canDisableNetfilterConntrackHelpers = true;
				features.netfilterRPFilter = true;
			})
		;

	customKernel = customKernelFn {
		stdenv = pkgs.stdenv;
	  fetchurl = pkgs.fetchurl;
    perl = pkgs.perl;
    buildLinux = pkgs.buildLinux;

		kernelPatches = with pkgs.kernelPatches;
			[ kernelPatches.bridge_stp_helper
				kernelPatches.qat_common_Makefile
				kernelPatches.hiddev_CVE_2016_5829
			]
			++ lib.optionals ((platform.kernelArch or null) == "mips")
			[ kernelPatches.mips_fpureg_emu
			kernelPatches.mips_fpu_sigill
				kernelPatches.mips_ext3_n32
			];

	};

	customKernelPackages = pkgs.recurseIntoAttrs
		(pkgs.linuxPackagesFor customKernel pkgs.linuxPackages_custom);
in

{
  imports = [
    # Base configuration
    "${configDir}/base-configuration.nix"

    # Program configuration
    "${configDir}/programs/default.nix"

    # Filesystem additions
    "${configDir}/fs/yuu.nix"

    # Users
    "${configDir}/users/m.nix"

    # Services
    "${configDir}/services/sshServer.nix"
    "${configDir}/services/x.nix"
  ];

  boot.kernelPackages = customKernelPackages;
  
  # Define on which hard drive you want to install Grub.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  boot.initrd.availableKernelModules = [ "ehci_pci" "ahci" "usb_storage" ];
  boot.initrd.kernelModules = [ "fbcon" "kvm-intel" ];
  boot.initrd.luks.cryptoModules = [ "aes" "sha256" "sha1" "cbc" ];

  networking = {
    hostName = "yuu-kernelvm";
    nameservers = [ "8.8.8.8" "8.8.4.4" ];
    wireless.enable = false;
    useDHCP = false;
  };

  nixpkgs.config.allowUnfree = false;

  environment.variables = {
    CONFIG_DIR  = "~/config";
    EDITOR      = "nvim";
  };

  environment.systemPackages = let
    basePkgs    = import "${configDir}/pkgs/basePackages.nix" pkgs;
    analyzePkgs = import "${configDir}/pkgs/analyzePackages.nix" pkgs;
    devPkgs = import "${configDir}/pkgs/devPackages.nix" pkgs;
    docPkgs = import "${configDir}/pkgs/docPackages.nix" pkgs;
    networkingPkgs = import "${configDir}/pkgs/networkingPackages.nix" pkgs;
    nvimPkgs = import "${configDir}/pkgs/neovim.nix" pkgs;
  in
    basePkgs ++
    analyzePkgs ++
    devPkgs ++
    docPkgs ++
    networkingPkgs ++
    nvimPkgs;

}
------------->8-------------


On 27-06-2016 21:50:38, Layus wrote:
> Hi,
> 
> Basically you need to build the vm attribute from
> <nixpkgs>/nixos/default.nix.
> 
> You can do this with
> nix-build /path/to/nixpkgs/nixos -A vm
> or even with
> nixos-rebuild build-vm
> 
> You also need to specify an alternate nixos config, which you can do using
> 
> NIXOS_CONFIG=/path/to/custom/configuration.nix
> or using nixos-config in nix-path (as below).
> 
> For your setup, the simplest way may be to
> 
>     NIXOS_CONFIG=/my/configuration.nix nixos-rebuild build-vm
> 
> Anyway, you will obtain a script to start the vm.
> 
> Now, bear in mind that the vm is started with QEMU & KVM, so you may need to
> tune the options if you want your developpment kernel to be fully used.
> Read the produced script if you want more insight into qemu options.
> If I remember well, in my setup the network stack of the guest was not used,
> the host kernel was used instead, even in the VM.
> I am no expert, so I may be wrong. Just keep it in mind if you experience
> strange results.
> 
> You may also need to avoid full kernel compilation during dev iterations.
> There may be hints at how to do that in [1].
> Do not hesitate to share your final setup at the end :-).
> 
> -- Layus.
> 
> [1] http://lists.science.uu.nl/pipermail/nix-dev/2016-April/020336.html
> 
> On 27/06/16 21:10, joachifm at fastmail.fm wrote:
> > On Mon, Jun 27, 2016, at 08:52 PM, Matthias Beyer wrote:
> > > basically what I do with `nixos-rebuild build-vm` but from another
> > > configuration.nix than my system-configuration.nix.
> > You probably want something like
> > ```
> > $ nix-build -I nixpkgs=/my/nixpkgs -I nixos-config=/my/configuration.nix
> > '<nixpkgs/nixos>' -A vm
> > $ ./result/bin/run-nixos-vm
> > ```
> > or some variation thereof.
> > 
> > HTH,
> > Joachim
> > _______________________________________________
> > nix-dev mailing list
> > nix-dev at lists.science.uu.nl
> > http://lists.science.uu.nl/mailman/listinfo/nix-dev
> 
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-- 
Mit freundlichen Grüßen,
Kind regards,
Matthias Beyer

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