Tonight in "Fun with
#FOSS":
I installed gerbera to do DLNA things. Config dot freaking XML should've been a warning sign, but I know how to computer.
It took about half an hour until I figured out from the docs what XML tag I should use and where to point to the directory where my media content is (it's not in the default config).
The fun begins when the systemd unit just exists. There is a logging option, but no hint about where the logs are. Nvm, journalctl captured stdout:
"level attribute is missing or invalid"
There is no "level" attribute in the docs.
Googling: 0 result - spoiler: this is because the second part of the message comes from an XML lib, while the attribute name comes from the XSD.
The solution is to checkout the git tag corresponding to the OS package version, find the XSD and the attribute definition in it. I fixed the config.
The software now runs (it just doesn't work).