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Fri Sep 8 2023

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Sep 8 2023 00:55 UTC

²²/₅₀ words

7s read

Ho, some of us think alike. I stumbled onto this site while looking up related unshare namespace configuration. I do something similar.

#linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Fri May 5 2023 (edited)

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May 5 2023 23:07 UTC

69/₅₀ words

23s read

Different words similar meaning? --references is NixOS speak for direct package dependencies. --requisites list all. These work with the nix-store command.

  
    shell
  
  $ readlink --canonicalize "$(type -P which)"
/nix/store/r78jv9xgxnvsm5vpasf5ldkc28pkri6r-which-2.21/bin/which

$ nix-store --query --references /nix/store/r78jv9xgxnvsm5vpasf5ldkc28pkri6r-which-2.21
/nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163

which directly depends on glibc. Swap --references to --referrers for paths pointing to which.

On Guix, list/draw dependencies with guix graph.

  
    shell
  
  guix graph --type=references which
nix-store --query --tree "$(readlink --canonicalize "$(type -P which)")"

#gists #linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Mon Apr 3 2023

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Apr 3 2023 21:34 UTC

61/₅₀ words

20s read

I’ve had a draft post of Guix notes written up for a while now. Did you know that it’s easy to generate a file system specified from a config.scm? It’s somewhat equivalent to nixos-install, pacstrap and the like.

shell

guix system init --no-bootloader config.scm filesystem/

Why? Commands like this are handy for messing around with chroots, containers, and other related stuff!

#linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Sat Jan 21 2023 (edited)

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Jan 21 2023 15:10 UTC

68/₅₀ words

23s read

Look at this Makefile — then look at this NixOS package derivation. Appears simple but I couldn’t for the life of me divine how to quickly compile a custom/patched kernel module on NixOS. Abstractions… are very magical. The guide is cool and all, but it’s a better time investment to guesstimate the relationship between the higher/lower layer. This friendly example looks more like this in reality though ;-)

#linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Sat Jan 21 2023

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Jan 21 2023 13:53 UTC

191/₅₀ words

64s read

A NixOS configuration for a working sound driver on an A1418 Cirrus Logic CS8409/CS42L83.

  
  
    nix
  
  
  { stdenv, lib, fetchgit, linuxKernel, kernel ? linuxKernel.kernels.linux_5_15
, version ? "d0d785dc1859b09299bde6d0f1d6786a0d610e7f" }:

stdenv.mkDerivation {

  inherit version;
  name = "sna-hda-codec-cs8409-${version}-module-${kernel.modDirVersion}";

  # Upstream: https://github.com/davidjo/snd_hda_macbookpro

  src = fetchgit {
    url = "https://github.com/egorenar/snd-hda-codec-cs8409.git";
    rev = version;
    sha256 = "sha256-0UeoERcYpM+ojeZ7dDIE3ruTIoHkkC+s7FcoEVUTR0w=";
  };

  hardeningDisable = [ "pic" ];
  nativeBuildInputs = kernel.moduleBuildDependencies;

  NIX_CFLAGS_COMPILE = [ "-g" "-Wall" "-Wno-unused-variable" "-Wno-unused-function" ];

  makeFlags = kernel.makeFlags ++ [
    "INSTALL_MOD_PATH=$(out)"
    "KERNELRELEASE=${kernel.modDirVersion}"
    "KERNEL_DIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
  ];

  postPatch = ''
    printf '
    snd-hda-codec-cs8409-objs := patch_cs8409.o patch_cs8409-tables.o
    obj-$(CONFIG_SND_HDA_CODEC_CS8409) += snd-hda-codec-cs8409.o

    KBUILD_EXTRA_CFLAGS = "-DAPPLE_PINSENSE_FIXUP -DAPPLE_CODECS -DCONFIG_SND_HDA_RECONFIG=1"

    KERNELRELEASE ?= $(shell uname -r)
    KERNEL_DIR    ?= /lib/modules/$(KERNELRELEASE)/build
    PWD           := $(shell pwd)

    default:
    	make -C $(KERNEL_DIR) M=$(PWD) CFLAGS_MODULE=$(KBUILD_EXTRA_CFLAGS)

    install:
    	make -C $(KERNEL_DIR) M=$(PWD) modules_install
    ' \
    > Makefile

    sed --in-place 's|<sound/cs42l42.h>|"${linuxKernel.kernels.linux_6_0.dev}/lib/modules/${linuxKernel.kernels.linux_6_0.modDirVersion}/source/include/sound/cs42l42.h"|'  patch_cs8409.h
    sed --in-place 's|hda_local.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_local.h|'                                                      patch_cs8409.h
    sed --in-place 's|hda_jack.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_jack.h|'                                                        patch_cs8409.h
    sed --in-place 's|hda_generic.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_generic.h|'                                                  patch_cs8409.h
    sed --in-place 's|hda_auto_parser.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_auto_parser.h|'                                          patch_cs8409.h
  '';

  meta = { platforms = lib.platforms.linux; };
}

Then build it as a extra/custom kernel module. The results of stumbling upon yet another troublesome device…

  
  
    nix
  
  
  { pkgs, ... }:

{
  boot = {
    extraModulePackages = [
      (pkgs.callPackage ../packages/snd-hda-cs8409/default.nix {
        kernel = pkgs.linux_5_15;
      })
    ];
  };
}

#gists #linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Fri Jan 6 2023 (edited)

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Jan 6 2023 03:23 UTC

145/₅₀ words

48s read

My default nix configuration on NixOS.

This configuration is more for building/debugging stuff and caching with nix-serve. Usually my package version is locked since different versions of nix can have some effects.

  
  
    nix
  
  
  { config, ... }:

{
  nix = {
    package = (import ../versions.nix).nix_2_17 { inherit config; };
    settings = {
      log-lines = 25;                                # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-log-lines
      fallback = true;                               # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-fallback
      tarball-ttl = 0;                               # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-tarball-ttl
      show-trace = true;                             # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-show-trace
      connect-timeout = 5;                           # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-connect-timeout
      auto-optimise-store = true;                    # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-auto-optimise-store
      narinfo-cache-negative-ttl = 0;                # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-narinfo-cache-negative-ttl
      narinfo-cache-positive-ttl = 0;                # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-narinfo-cache-positive-ttl
      builders-use-substitutes = true;               # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-builders-use-substitutes
      min-free = 268435456;                          # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-min-free (256 MB in Bytes)
      max-free = 1073741824;                         # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-max-free (1 GB in Bytes)
      allowed-users = [ "root" "@wheel" ];           # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-allowed-users
      trusted-users = [ "root" "@wheel" ];           # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-trusted-users
      experimental-features = "nix-command flakes";  # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-experimental-features
    };
  };
}

#gists #linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Thu Jan 5 2023

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Jan 5 2023 02:30 UTC

96/₅₀ words

32s read

I thought about posting notes on Syncthing but then I’d have to tangentially talk about NixOS. NixOS is my main Linux distribution atm but Nix/NixOS/Flakes are too hard to write about and I fear they’ve ventured too far into the realm of over–engineering.

What do I mean by over–engineering? An over–engineered tool is one where even the simplest use cases are non–obvious (to most people) and this can happen when it tries to do too many things with “specificity”. The overall concept is elegant though (explainable in lay terms) and can be applied in other contexts.

#linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Tue Nov 1 2022 (edited)

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Nov 1 2022 13:11 UTC

66/₅₀ words

22s read

I feel sorta conflicted about my posted notes on nixops because shortly after that I discovered nixos-rebuild had remote deploys. Now nixos-rebuild itself is just a bash script and taking a peek inside is well, you know.. enlightening. There’s even a NixOS deployment tool written in just nix. I use nixos-rebuild…

  
    shell
  
  nixos-rebuild switch \
  --target-host "nix@remote.host" \
  --build-host "localhost" \
  --no-build-nix

#linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Thu Oct 27 2022

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Oct 27 2022 02:36 UTC

59/₅₀ words

20s read

The nix packages collection has a neat library repository. A small nudge can make it completely standalone. Basically it allows experimenting quickly with configuration patterns for custom stuff without an expensive evaluation.

#clips #linux

Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.

tdro

Sat Oct 8 2022

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