Daryl Tucker daryltucker

Internal Post-Mortem: cpal Migration Failures

What Happened

During the cpal migration and Windows CI setup, I made several critical errors:

Tried to write without reading first — Attempted to write to platform_audio.rs without reading it, causing the write to fail
Duplicate code remained after edits — Leftover code from failed edits caused compilation errors (duplicate function bodies, malformed closures)
Multiple edit attempts on Cargo.toml — Had to retry several times due to not reading the file state correctly
Build failures requiring fixes — Had to fix borrow checker issues with captured variables in closures

OSX / Macbook Linux Thumb

# Wipe the drive and create a fresh GPT table with a single EFI partition
# (Using sgdisk for non-interactive precision)
sudo sgdisk --zap-all /dev/sdg
sudo sgdisk --new=1:0:0 --typecode=1:ef00 /dev/sdg

# Format the partition as FAT32 (MS-DOS)
# Macs expect the EFI loader on a standard FAT32 filesystem.

Beware! The NVIDIA 590 Driver...

Replace nvidia-dkms with extra/nvidia-open-dkms?

# [~] 
# daryl@nifflheim $ lspci | grep NVIDIA
01:00.0 VGA compatible controller: NVIDIA Corporation GM206 [GeForce GTX 960] (rev a1)

You get the idea...

.bash_profile evaluated once at login, but sets up the non-interactive trap
BASH_ENV forces non-interactive shells to source instead of skip sourcing upon init
You can source the watchguard again at the end of ~/.bashrc to catch interactive-shell

BONUS

NVIDIA Docker Container Runtime

nvidia-smi --query-gpu=index,name,uuid,pci.bus_id --format=csv

Enable the Module

sudo modprobe nvidia-uvm

Patching NVIDIA 470.256.02 for Linux Kernel 6.12 -> 6.13 Transition (Debian 13)

Assuming you have the appropriate patches and had DKMS working...

0001-Fix-conftest-to-ignore-implicit-function-declaration.patch
0002-Fix-conftest-to-use-a-short-wchar_t.patch
0003-Fix-conftest-to-use-nv_drm_gem_vmap-which-has-the-se.patch
nvidia-470xx-fix-gcc-15.patch
kernel-6.10.patch

`kmscon` w. `btop`

Create `btopuser`

sudo adduser --system --no-create-home --shell /usr/sbin/nologin btopuser
sudo addgroup --system procview
sudo usermod -a -G procview btopuser
sudo usermod -a -G video btopuser

	squeeze -> gcc 4.6.1 (kernel linux-image-2.6.32-5)
	wheezy -> gcc 4.8.4 (kernel linux-image-3.2.78-1)
	jessie -> gcc 4.9.2 (kernel linux-image-3.16.56-1)
	stretch -> gcc 5.3 (kernel linux-image-4.9.228-1)
	buster -> gcc 5.5 (kernel linux-image-4.19.249-1)
	bullseye -> gcc 10 (kernel linux-image-5.10.223-1)
	bookworm -> gcc 11 (kernel linux-image-6.1.148-1)
	trixie -> gcc 12 (kernel linux-image-6.12.43-1)

	# Ensure tmux is storing history properly
	HISTFILE=~/.bash_history
	export HISTCONTROL=ignoredups:erasedups,ignoreboth
	if [ -n "$TMUX" ]; then
	HISTFILE=$(mktemp)
	history -r ~/.bash_history
	trap 'history -a ~/.bash_history; rm "$HISTFILE"' EXIT
	else
	trap 'history -a ~/.bash_history' EXIT
	fi