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When systemd's main() function is started it then goes through a careful process of setting things up, i.e. establishing mounts, making things writable, loading security policies, initializing certain devices, RNGs, and so on, loading configuration and many many other things. This is carefully scheduled to be done in the right order, since after all we cannot assume that things are already set up for us, we have to do the setup *ourselves* after all.