systemd-update-done.service - Man Page

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) stored in and "on" the files /etc/.updated and /var/.updated to the modification time of the /usr/ directory, unless the stamp files are already newer. (The timestamp is stored as the mtime field on the file, but also in the file to support filesystems that do not store full timestamp precision.)

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.

The following options are understood:

--root=root

Takes a directory path as an argument. The program will operate on paths below the specified root directory.

Added in version 258.

-h,  --help

Print a short help text and exit.

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

systemd.directives(7), systemd.index(7), systemd.unit(5).

The man page systemd-update-done(8) is an alias of systemd-update-done.service(8).