Installing an update might make further updates available, for example
because the update ships new or changed transfer files, components, or
system extensions containing such files. Hence add a new --loop=N
switch, which runs the update logic repeatedly, re-reading all
definitions each time, until either nothing is installed anymore, or N
iterations have been done.
If --reboot is specified the reboot is requested once, after the last
iteration.
Not specifying --loop= is equivalent to --loop=1, i.e. the behaviour
remains unchanged.
Lennart Poettering