Requirements

Finit is capable of running on both desktop/server systems with udev and embedded systems that usually come with BusyBox mdev. Some systems have systemd-udev or eudev today instead of the original udev, Finit probes for all of them at runtime and expects /dev/ to be a writable file system using devtmpfs. It is also possible to run on a statically set up /dev if needed. It is however not a good idea to have both udev and mdev installed at the same time, this will lead to unpredictable results.

At boot Finit calls either mdev or udevd to populate /dev, this is done slightly differently and on systems with udev you might want to add the following one-shot task early in your /etc/finit.conf:

run [S] udevadm settle --timeout=120 -- Waiting for udev

Finit has a built-in Getty for TTYs, but requires a working /bin/login or /bin/sh, if no TTYs are configured in /etc/finit.conf.

For a fully operational system /var, /run and /tmp must be set up properly in /etc/fstab -- which is iterated over at boot.