* maybe add "systemctl edit" that copies unit files from /usr/lib/systemd/system to /etc/systemd/system and invokes vim on them
-* maybe introduce AssertXYZ= similar to ConditionXYZ= that causes a unit to fail (instead of skipping it) if some condition is not true...
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* refcounting in sd-resolve is borked
* exponential backoff in timesyncd and resolved when we cannot reach a server