patches and low-level development discussion

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 #!/bin/execlineb -Wp
# SPDX-License-Identifier: EUPL-1.2+
# SPDX-FileCopyrightText: 2021, 2025 Alyssa Ross <hi@alyssa.is>

multisubstitute {
  importas -Siu WAYLAND_DISPLAY
  importas -Si 1
}

cgroup-setup --leaf --no-wait -- $1

piperw 4 3
background {
  fdclose 3

  if {
    fdmove -c 0 4
    redirfd -w 1 /dev/null
    head -c 1
  }
  fdclose 4

  if { chmod -- 0770 $WAYLAND_DISPLAY }
  if { chgrp -- wayland $WAYLAND_DISPLAY }

  fdmove -c 1 5
  echo
}
fdclose 4
fdclose 5

# Workaround for
# https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/1911
if { mkdir -p -m 0700 /run/user/0 }

backtick USER { id -un }
backtick HOME {
  importas -i user USER
  homeof $user
}

if { install -do wayland -g wayland -m 0770 /run/wayland }
if { chown wayland /dev/tty0 /dev/tty1 }
redirfd -r 0 /dev/tty1

importas -i home HOME
cd $home
if { udevadm settle }
s6-setuidgid wayland
bwrap
  # no --unshare-net, breaks udev hotplug
  --unshare-ipc
  --unshare-uts
  --unshare-cgroup
  --cap-add CAP_SYS_TTY_CONFIG
  --dev-bind /dev /dev
  --bind /run /run
  --ro-bind /etc /etc
  --ro-bind /nix /nix
  --ro-bind /usr /usr
  --ro-bind /lib /lib
  --ro-bind /bin /bin
  --ro-bind /sbin /sbin
  # For /run/seatd.sock
  --tmpfs /run
  # For OpenGL/Vulkan/etc
  --ro-bind /run/opengl-driver /run/opengl-driver
  # For udev
  --ro-bind /run/udev /run/udev
  --bind /run/root-terminal /run/root-terminal
  --tmpfs /tmp
  --tmpfs /dev/shm
  # Filtered /proc (without nasty stuff)
  --proc /proc
  --ro-bind /proc/sys /proc/sys
  --tmpfs /proc/fs
  --remount-ro /proc/fs
  --tmpfs /proc/irq
  --remount-ro /proc/irq
  --ro-bind /dev/null /proc/kallsyms
  --ro-bind /sys /sys
  --dev /dev
  # GPUs
  --dev-bind /dev/dri /dev/dri
  # Input devices
  --dev-bind /dev/input /dev/input
  # Virtual consoles
  --dev-bind /dev/tty1 /dev/tty1
  --dev-bind /dev/tty0 /dev/tty0
  # Kernel console
  --dev-bind /dev/console /dev/console
  # So that Weston can create its listening socket
  --bind /run/user/0 /run/user/0
  --bind /run/wayland /run/wayland
  --
weston -S $WAYLAND_DISPLAY