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 ;-)
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.
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.
A NixOS configuration for a working sound driver on an A1418 Cirrus Logic CS8409/CS42L83.
{ 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…
{ pkgs, ... }:
{
boot = {
extraModulePackages = [
(pkgs.callPackage ../packages/snd-hda-cs8409/default.nix {
kernel = pkgs.linux_5_15;
})
];
};
}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.
Bots are ≈ 80% noise. It’s funny that in general analytics are not needed anymore. 80% noise and 20% signal. 80:20. It’s safe to turn off the computer and head outside — you’re not missing much when not on the Internet (it’s smaller than you’d think signal–wise).
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.
I had some time to futz about updating my Isso setup and forgot that a while back they added Atom Feeds. It’s also neat that it uses Atom Threading (an example). Installation from source is easier too.
Index: Cache · Source
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.
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.
{ 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
};
};
}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.
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.
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.
Here’s a final muse for current year. This probably counts as
The Internet/Blockchain/whatever is not a truth machine and could never be a truth machine. Inside events/stories/happenings everyone’s just as clueless as in past eras and technological differences become “functionally equivalent” — meaning you either waste time separating signal from noise in “fast” and “fake” information infinitum or waiting for “slow” and “official” carrier pigeons to arrive.
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.
I’ve since realized that Hugo’s architecture provides a variety of template optimization strategies. Hugo builds pages concurrently, so it might be hard to see on a modern device but before partialCaches or module mount trickery — there’s still the implicit complexity of the output/lookup model.
Generally the complexity cost of the default output formats are: page > term > taxonomy > section > home. Keeping expensive calls inside a section and/or a home template is usually optimal. and maybe memory should be the only problems with lots of pages.
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.
The blog linked in a previous post is a gem. Too bad the current site doesn’t appear to have all the archived posts, you need strong search–fu to find them on archive.org.
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.
Hugo is a gateway for discovering neat golang libraries. Version 0.104.0 introduced a color extraction method that has lots of use–cases. An easy one is to generate basic image gradient placeholders. The browser has its own deferred/lazy loading logic so fancy image gradients (on a static site) require only a few lines of pre–generated styles.