On 11 February 2018 at 13:47, Giacomo Longo via arch-general wrote:

So you want to have

vboxadd-service and vboxadd systemd services not starting on Linux kernel versions 4.15 and above?

You can manage this by creating a template systemd unit

/etc/systemd/system/kernel-version-less-then@.service ----------------------------------- [Unit] Description=Check if currently installed kernel version is less than target

[Service] Type=oneshot ExecStart=/usr/bin/sh -c '[[ "$(/usr/bin/vercmp %i %v)" = "1" ]]' Restart=no CollectMode=inactive-or-failed

[Install] WantedBy=multi-user.target

Then create the directories

/etc/systemd/system/vboxadd.service.d/ /etc/systemd/system/vboxadd-service.service.d/

Then for each service

/etc/systemd/system/vboxadd.service.d/kerver.conf ------------------------------------------------- [Unit] After=kernel-version-less-then@4.15.service Requires=kernel-version-less-then@4.15.service

/etc/systemd/system/vboxadd-service.service.d/kerver.conf --------------------------------------------------------- [Unit] After=kernel-version-less-then@4.15.service Requires=kernel-version-less-then@4.15.service

In this way, if my bash-fu is correct, the version compare will fail the kernel-version-less-then@4.15.service and vboxadd and vboxadd-service will not start

there is ConditionKernelVersion= man systemd.unit -- damjan

On 02/11/2018 08:14 AM, Giacomo Longo via arch-general wrote:

You can also use ConditionKernelVersion like so

/etc/systemd/system/{vboxadd,vboxadd-service}.service.d/kerver.conf ------------------------------------------------- [Unit] ConditionKernelVersion=<4.15

Giacomo Longo

Yes! Thank you Giacomo and Damjan. This is exactly what I was looking for but knew not what it was or where it lived in systemd. This should allows an if (kernelver < 4.15) load the vboxguest modules. -- David C. Rankin, J.D.,P.E.