On my main machine I use an excellent cross-platform tool called Docuum that automatically cleans up unused docker images. This allows me to use Docker without the need to periodically wonder why I’m out of disk space, run docker system prune and recover half my disk. I installed Docuum via the AUR package (although tweaked to build the latest Docuum release) and ran it via the bundled systemd service definition. This worked great for a while but some time back it started failing. Every time Docuum would try to check for things to clean up I’d see the following in the system journal: