tmpfiles: drop /run/lock/lockdev Hardly any software uses that any more, and better locking mechanisms like flock() have been available for many years. Also drop the corresponding "lock" group from sysusers.d/basic.conf.in, as nothing else is using this.

sysusers: set home directory for root to /root

sysusers: split up default sysusers snippet This ways, distributions have an easier way to replace the OS specific generic groups/users while keeping systemd's own.