The current argument is unused and it should have been removed
with commit 81229329f1
("Generate download clients using a builder class"). Instead of
removing it completely, use it to pass the File of the download.
This change allows to define a proper interface for the download
client and keep its implementation completely separate. It also
allows to create clients without starting the download right away,
which could be useful when defining callbacks that require a
reference to the client.
Note that this change also drops the unused methods of DownloadClient.
The files are supposed to be downloaded in a privileged location
that the user can't access. If the user wipes the data of the
application, the updates downloaded are not removed. Perform a
one-time cleanup so that our downloads dir doesn't grow without
control.
Compare the previously downloaded updates list with the current one
and check if the old list includes all the updates of the new list.
If the network is not available at the time of the check, a new
check is scheduled.
Gabriele M