why would you need to gather extra entropy? are you on a system with no persistent storage?
$ systemctl show systemd-random-seed.service | grep ExecStop ExecStop={ [...] argv[]=/lib/systemd/systemd-random-seed save [...]
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so yeah, systemd already does that. which is also exactly what the kernel sources recommend: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/char/random.c#n162 …
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except that for the code executed on boot to actually work properly, you'd have to use the new RNDRESEEDCRNG ioctl
End of conversation
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