c2911d48ff
Instead of assuming that more-recently modified directories have higher mtime, just look for any mtime changes, up or down. Since we don't want to remember individual mtimes, hash them to obtain a single value. This should help us behave properly in the case when the time jumps backwards during boot: various files might have mtimes that in the future, but we won't care. This fixes the following scenario: We have /etc/systemd/system with T1. T1 is initially far in the past. We have /run/systemd/generator with time T2. The time is adjusted backwards, so T2 will be always in the future for a while. Now the user writes new files to /etc/systemd/system, and T1 is updated to T1'. Nevertheless, T1 < T1' << T2. We would consider our cache to be up-to-date, falsely.
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