dbanetto / wallutils-systemd

Some user systemd units for setting wallpapers

wallutils-*.service

A collection of systemd service files focused on changing wallpapers.

These are designed to be run as systemd user services & timers.

Dependencies

The following dependencies are required

• systemd (default on systemd-based distros)
• envsubst (default on most distros)
• wallutils

Configuration

## Config
WALLPAPER_PATH="${HOME}/Pictures/Wallpapers" # <== path to wallpapers
# When 
# see system.timer(5) for timing syntax
STARTUP_DELAY="1m" # <== delay between starting up & first run
CHANGE_EVERY="1h" # <== delay until next run

What is going on?!

The magic sauce here is using envsubst as a basic templating engine.

It replaces bash-like variables ${VAR} with the value of the corresponding environment variable.

To ensure that other troublesome variables do not show up it is executed with a clean env that has expected variables passed in to it.

This is all a bit of a overkill for this context but a fun way to explore envsubst .As far as I can tell, at least on Arch Linux, is installed by default so a nice low dependency templating "engine".