I guess uselessd is fundamentally impossible then, along with other systems that provide the same functionality. Again, if it were impossible there wouldn't need to be a policy against it.
"uselessd is planned to work as a primitive stage 2 init (process manager) on FreeBSD. Stage 1 is inherently unportable requires a total overhaul in regards to low-level system logic (with systemd assuming lots of mount points and virtual file systems that aren’t present, is designed with an initramfs in mind and many other things). Stage 3 can always be achieved by having a sloppy shim around the standard tools like shutdown, halt, poweroff, etc.
So far, uselessd compiles on BSD libc with a kiloton of warnings, with lots of gaps and comments in the code, and macros/substitutions in other places. All in all, it is an eldritch abomination. A slightly patched version of Canonical’s systemd-shim is provided and works well enough to emulate the org.freedesktop.systemd1 D-Bus interface. Some of the binaries provide diagnostic information, but at present we are trying to find ways to bring up the Manager interface in the whole buggy affair, in order for systemctl to send method calls. Nonetheless, you are absolutely welcome and encouraged to play around with it in its present state, and we hope to get somewhere eventually."
