Bug#972872: apt.systemd.daily should vary exit code based on unattended-upgrades failures

[Filippo Giunchedi <filippo@debian.org>]

Package: apt
Version: 1.8.2.1
Severity: normal

Hi,
I've ran into a situation where an unattended-upgrades run would fail to
upgrade packages on an host. I'm using the u-u APT integration, thus u-u is
called via /usr/lib/apt/apt.systemd.daily and its corresponding service+timer.

Even on a failed u-u run the apt-daily-upgrade.service unit is still reported a
successful, AFAICT because apt.systemd.daily exits 0 even when u-u fails. I
think it makes sense to surface u-u errors back and thus fail the systemd
service, does that seem reasonble? What do you think re: surfacing other errors
as well?

thank you!
Filippo