read_battery_capacity_percentage() was already logging, but with a slightly different wording. More could be done, I just touched the most noticable places. Especially in debug messages, it is much more useful to be direct about what couldn't be accessed or parsed, instead of providing "descriptive names" which are not useful to the user at all, who then needs to read the code to figure out what was the actual property name.
System and Service Manager
Details
Most documentation is available on systemd's web site.
Assorted, older, general information about systemd can be found in the systemd Wiki.
Information about build requirements is provided in the README file.
Consult our NEWS file for information about what's new in the most recent systemd versions.
Please see the Code Map for information about this repository's layout and content.
Please see the Hacking guide for information on how to hack on systemd and test your modifications.
Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.
When preparing patches for systemd, please follow our Coding Style Guidelines.
If you are looking for support, please contact our mailing list or join our IRC channel.
Stable branches with backported patches are available in the stable repo.
