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Tue Nov 28 2023

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Nov 28 2023 23:21 UTC

68/₅₀ words

23s read

Many fortnights ago, I foolishly thought writing a GTK3 theme from scratch would be easy. It was mostly CSS unlike GTK2. About 40 minutes in came a horrifying realization: there’s fundamentally (and definitely) no way to write a consistent theme that works reliably with every application. The minor upside was a working (and somewhat accessible) wireframe theme and a basic understanding of debugging. The end.

  
    shell
  
  GTK_DEBUG=interactive firefox

#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 Nov 16 2023 (edited)

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Nov 16 2023 14:41 UTC

130/₅₀ words

43s read

An actual but where did my Linux memory go command;
This program (repositories) came in handy while helping someone resolve an oom problem. Want to see memory usage and shared memory, perhaps sorted by swap?

shell

smem -s swap -kta
smem --sort swap --abbreviate --totals --autosize

What about on other categories running a --sort?

  
  
    text
  
  
  swap     (amount of swap space consumed ignoring sharing)
command  (process command line)
maps     (total mappings count)
name     (process name)
pid      (process id #)
user     (process owner)
pss      (proportional set size including sharing)
rss      (resident set size ignoring sharing)
uss      (unique set size)
vss      (virtual set size; total virtual memory mapped)

Bonus: A filesystem usage command to catch /tmp/ and tmpfs (temporary file storage) abusers;

  
    shell
  
  df -h | grep tmpfs
df --human-readable | grep tmpfs

#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

Sun Nov 5 2023

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Nov 5 2023 14:59 UTC

⁴⁶/₅₀ words

15s read

Incus is worth a look. It’s the fork of LXD, a container and vm orchestration/hypervisor program for cluster setups and infra models. Incus sits on top of the lower level LXC (Linux Containers).

Incus Documentation: https://linuxcontainers.org/incus/docs/main/
Incus Package Files: https://github.com/zabbly/incus#readme
Incus Repository: https://github.com/lxc/incus#readme
Incus Demo: https://linuxcontainers.org/incus/try-it/

#linux #lists

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 Sep 22 2023

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Sep 22 2023 17:48 UTC

86/₅₀ words

29s read

Some nix language gotchas I’ve experienced while using NixOS personally:

Avoid with expressions unless with the inherit keyword for identifying hidden attributes in scope.
Avoid the rec keyword unless there’s tracking/control of infinite set recursion (self naming/references).
Avoid importing more than 1 instance of <nixpkgs> for any evaluation chain unless there’s magic compute and “infinite” memory.

Tricky is numero three, but crucial for fast feedback regardless of the current thing? I don’t poke around as much to know anymore but; legacy, flakes, community, and possibly others.

#linux #lists

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 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

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May 5 2023 23:07 UTC

61/₅₀ words

20s 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

#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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