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#TIL #systemd can somehow restart itself in a running system and #NixOS does it automatically whenever necessary.

This must have happened dozens of times already and I never noticed because it's entirely seamless.

I only found out because I was curious what exactly the #NixOS activation script means when it says "restarting systemd" as that struck me as near impossible.

I confirmed that /proc/1/exe points at the same store path that my new version of systemctl comes from; how cool is that?