Please document when updates are downloaded when in InstallOnShutdown is used

[Yvan-Masson]

Hi,

Could you document, both in /etc/apt/apt.conf.d/50unattended-upgrades and /usr/share/doc/unattended-upgrades/README.md.gz, nearby option Unattended-Upgrade::InstallOnShutdown, when are updates downloaded in this mode? Is this when apt-daily.service runs or when system shutdowns?

This is important because if packages are downloaded during normal use, admin would probably use Acquire::http::Dl-Limit to keep bandwidth for user, but in the other case we probably want to download updates as fast as possible so that the user does not wait too long that his/her computer shutdowns.

Regards,
Yvan

[Yvan-Masson]

I tried to understand a bit more by myself. If I am not wrong, packages download can be done at two different times:

• during run of apt-daily.service, depending of the value of APT::Periodic::Download-Upgradable-Packages
• during shutdown by unattended-upgrades.service, if packages have not been downloaded yet

Am I correct?