Manpages - systemd-update-done.service.8

systemd-update-done.service, systemd-update-done - Mark etc and var fully updated

systemd-update-done.service

/usr/lib/systemd/systemd-update-done

systemd-update-done.service is a service that is invoked as part of the first boot after the vendor operating system resources in usr have been updated. This is useful to implement offline updates of usr which might require updates to etc or var on the following boot.

systemd-update-done.service updates the file modification time (mtime) of the stamp files etc.updated and var.updated to the modification time of the usr directory, unless the stamp files are already newer.

Services that shall run after offline upgrades of usr should order themselves before systemd-update-done.service, and use the ConditionNeedsUpdate= (see *systemd.unit*(5)) condition to make sure to run when etc or var are older than usr according to the modification times of the files described above. This requires that updates to usr are always followed by an update of the modification time of usr, for example by invoking *touch*(1) on it.

Note that if the systemd.condition-needs-update= kernel command line option is used it overrides the ConditionNeedsUpdate= unit condition checks. In that case systemd-update-done.service will not reset the condition state until a follow-up reboot where the kernel switch is not specified anymore.

*systemd*(1), *systemd.unit*(5), *touch*(1)