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Those are irrelevant as they can't even do basic tasks like shutting down the computer or restarting it. Feel free to find a POSIX API for Linux' reboot syscall.
Some systems also require mounting additional filesystems, again not possible in a world limited to POSIX interfaces.
Sandboxing, SELinux, ...? Not in POSIX.
And so on.
And if "apt-get install sysvinit-core" is not trivial for you, then yes, you might need a special distribution doing that for you.
As a fun fact the thesis is released under a Creative Commons license, but states "no quotation from the thesis and no information derived from it may be published without the author's prior consent". Forbidding quotations and building further work on it is also an interesting approach to the idea of science.
Some desktop environments might want systemd-logind+systemd-shim, but that's really not different from installing systemd-elogind in Devuan...
But seriously, Devuan had some success with its core mission (drawing away the trolls and conspiracy theorists from Debian). They are now well integrated and discover most fascinating things (like that the vfat filesystem can be mounted in a way that non-root can write there! Wow! How did you discover this without reading the documentation?)
https://lists.dyne.org/lurker/message/20160426.180427.4d4815...
See for example the patch in Slackware: https://slackbuilds.org/mirror/slackware/slackware-current/s...
In reality that of course doesn't happen, so programs linking statically or including their own versions of shared libraries never get security updates for the included libraries.
Found your problem: you should never have someone generate a private key for you.
> Unix has a long tradition of doing a `rm -rf /` before reinstalling a system. I don't agree with the people saying "don't do that".
So, yes, "tradition".
It certainly doesn't remove any file contents and to get a clean state, surely reformatting would be both easier and quicker?