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tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink may 5 2023 21 sec 63/50 words

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
 #gists #linux
tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink apr 3 2023 21 sec 62/50 words

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
tdro

Another wandering soul screaming 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 micro.thedroneely.com (edited) view markdown plaintext embed permalink jan 21 2023 23 sec 68/50 words

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
tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink jan 21 2023 65 sec 194/50 words
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; };
}
../packages/snd-hda-cs8409/default.nix

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;
      })
    ];
  };
}
hardware.nix
#gists #linux
tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink jan 5 2023 49 sec 146/50 words
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_12 { 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
    };
  };
}
My nix-configuration.nix on version 22.11
#gists #linux
tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink jan 4 2023 32 sec 96/50 words

I thought about posting notes on Syncthing but then I’d have to tangentially talk about NixOS. NixOS is my main Linux distribution 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
tdro

Another wandering soul screaming 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 micro.thedroneely.com (edited) view markdown plaintext embed permalink nov 1 2022 22 sec 67/50 words

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
Build locally, deploy remotely
#linux
tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink oct 26 2022 20 sec 59/50 words
tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink oct 6 2022 25 sec 75/50 words

After daily driving NixOS and the Nix for almost three years, it feels like it’ll be simplified by entities external to the project. It’s still in that academic phase (don’t do this/that) and needs software engineering .

That usually involves reducing boilerplate ruthlessly while generalizing/capturing fundamental uses cases (setting implicit best current practices). It’s reminiscent of lxc just before docker arrived for the masses.

this blog is served to you by NixOS :-)

#linux
tdro

Another wandering soul screaming 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 micro.thedroneely.com view markdown plaintext embed permalink jul 31 2022 16 sec 48/50 words

I’m just now realizing that there might be a schism within the Nix/NixOS ecosystem/community on old versus new interfaces. If that’s remotely true, then somewhere, a great holy war is at play. Here’s an article summary of the old versus the new interface that I stumbled upon recently.

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