systemd 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.unit5) 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 touch1 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. systemd1 systemd.unit5 touch1