fd6ee7ed42
Let's flat out refuse to configure machine-id on a running system with systemd-firstboot. It wouldn't work anyway, because by the time firstboot is started, pid1 has created /etc/machine-id, possibly with "unitialized", so firstboot wouldn't touch the file. (If --force is specified, it works. So let's allow that in case people want to do crazy things.) While at it, add missing descriptions of various things that were added over time, and group descriptions of similar options together.
System and Service Manager
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