Since hotplugs happen as soon as udevd is started, there is not much sense
in giving udev-trigger an After= dependency on any service. The device
could be hotplugged before coldplug starts.
This is intended to avoid the race window where we create the hwdb with
the wrong selinux context (then fix it up afterwards).
https://github.com/systemd/systemd/issues/3458#issuecomment-322444107
Not that it would matter much, but let's make things a bit more
systematic: early boot services shall order themselves before
sysinit.target, and nothing else.
This naming convention is more inline with other systemd daemon
unit names (systemd-logind.service, systemd-localed.service etc)
The companion .socket units have also been renamed, however the
-trigger and -settle units keep their current name as these are
not directly related to daemon process itself.
Since the binary name is now hidden away in /usr/lib/ the primary user
handle for the udev service is the unit name, hence change the man page
to be available under the unit name, and make the binary name an alias
for it.
This should help making the boot process a bit easier to explore and
understand for the administrator. The simple idea is that "systemctl
status" now shows a link to documentation alongside the other status and
decriptionary information of a service.
This patch adds the necessary fields to all our shipped units if we have
proper documentation for them.
Lennart Poettering