- See editorial in the code-comment. Still need to test that
chroot(8) doesn't need a full path, otherwise this will
go to /usr/bin/env udevadm to force lookup (redundantly
if not in a chroot)
- Most of the time the working dir and stdin are not important,
you just want to run a command in the host, so simplify that
by providing a suitable overload.
- Use that overload from the partition service (for mount and sync).
