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Signage with Alpine linux on the raspberry pi
=== hardware ===
This guide works for the Raspberry Pi3 and Raspberry Pi4.
In case you want to run a viewer for Schlangenprogrammiernacht you'll need a Raspberry Pi4 as the javascript viewer ist quite demanding
=== setup image ===
* Format SD-Card as FAT32 with a MSDOS partition table
* Grab the base file system from the alpine linux [https://www.alpinelinux.org/downloads/ website] (pick aarch64)
* Mount new partition and unzip archive directly to SDcard
* umount and plug SDcard into raspberry pi
* boot and log in as "root" without entering a password
* Make sure the raspberry-pi is connected to the internet
=== prepare base system ===
* start "setup-alpine"
** select keyboard language (e.g. de-nodeadkeys)
** choose hostname (e.g. "signage")
** chose interface to listen for DHCP for (e.g. eth0)
** select timezone (e.g. Europe/Berlin)
** add user e.g. "sign"
** Agree to install on /dev/mmcblk0p1
** install as "sys"
* reboot the system
* (optional) continue via SSH
* select correct repositories
root> apk update
root> apk add nano
root> nano /etc/apk/repositories #uncomment the community repository
root> apk update
=== setup base system ===
* setup boot parameters
* add file /boot/usercfg.txt with the following content
root> echo "disable_overscan=1
dtoverlay=vc4-kms-v3d
gpu_mem=128" > /boot/usercfg.txt
* (optional) switch to udev
root> setup-devd
=== setup windowmanager ===
* install window manager
root> apk add screen
root> apk add seatd wlr-randr mesa-dri-gallium sway tinydm dbus
root> apk add wlr-randr wtype
* start seatd on boot and add "sign" to its group
root> rc-service seatd start
root> rc-update add seatd default
root> adduser
* copy and edit sway config for user "sign"
sign> cp /etc/sway/config ~/.config/sway
sign> echo "
# hide cursor
seat seat0 hide_cursor 8000
# force fullhd
output HDMI-A-1 mode 1920x1080
exec ~/swaystart.sh &" >> ~/.config/sway/config
sign> touch ~/swaystart.sh
* setup autostart for user "sign"
root> echo "AUTOLOGIN_UID=1000" >> /etc/conf.d/tinydm
root> rc-update add tinydm default
root> tinydm-set-session -s /usr/share/wayland-sessions/sway.desktop
* fix file permissions
sign> chmod +x ~/swaystart.sh
* configure XDG_RUNTIME_DIR
sign> echo "if test -z \"\${XDG_RUNTIME_DIR}\"; then
export XDG_RUNTIME_DIR=/tmp/\$(id -u)-runtime-dir
if ! test -d \"\${XDG_RUNTIME_DIR}\"; then
mkdir \"\${XDG_RUNTIME_DIR}\"
chmod 0700 \"\${XDG_RUNTIME_DIR}\"
fi
fi" > ~/.profile
=== setup browser (chromium) ===
You can use pretty much any browser that supports wayland. The default is chromium.
* install and autostart chromium
root> apk add chromium font-noto
sign> echo "#!/bin/sh
URL=https://schlangen.bytewerk.org/watch/
chromium-browser --kiosk -incognito \
--enable-features=UseOzonePlatform --ozone-platform=wayland \
--start-fullscreen --noerrdialogs --disable-infobars --disk-cache-dir=/dev/null \
--disk-cache-size=1 $URL &
while true; do
# after a while all browsers begin to stutter. Here is a crude fix
sleep 600
WAYLAND_DISPLAY=wayland-1 wtype -P F5
done" > ~/swaystart.sh
=== setup browser (falkon) ===
In case you don't want to use chromium you can also use another browser. For instance falkon.
* install and autostart falkon
sign> apk add falkon font-noto
sign> echo "#!/bin/sh
URL=http://example.com/
falkon -e -i -f $URL &
while true; do
# after a while all browsers begin to stutter. Here is a crude fix
sleep 600
WAYLAND_DISPLAY=wayland-1 wtype -P F5
done" > ~/swaystart.sh
=== setup SPN viewer ===
root> apk add font-noto-emoji # for snake emojis
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