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38fcb7f766
This copies the commands log-level and log-target (to query and set the current settings) from systemd-analyze to systemctl, essentially reverting a65615ca5d78be0dcd7d9c9b4a663fa75f758606. Controllling the log level settings of the manager is basic functionality, that should be available even if systemd-analyze (which is more of an analysis tool) is not installed. This is like dmesg and journalctl, which should be available even if a debugger and more advanced tools to analyze the kernel are not available. (Note that dmesg is used to control the log level too, not just to browse the kernel logs.) I chose to copy&paste the methods from analyze.c to the new location. There isn't enough code to share, because acquire_bus() in both places has a different signature despite the same name, so the only part that is common is the invocation of sd_bus_set_property().
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