Bug#778357: audit 'apt-get update' exit codes

[Patrick Schleizer <adrelanos@riseup.net>]

Package: apt
Severity: important
X-Debbugs-CC: holger@layer-acht.org,pabs@debian.org

When "apt-get update" fails the program under some conditions exits with
a 0 status. It would be useful if it exited with a non-zero status in
that case (or if there were a switch to tell it to do so).

Since there is already...

- provide meaningful exit codes for network failures
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776152

and

- apt: Provide meaningful exit codes for gpg failures
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745735

That have been found more or less by trial and error... I am wondering,
if there are any other situations, where this could happen.

Perhaps while you're at #776152 and #745735, could you please check if
there are other cases, where apt-get exits with a 0 status, where it
should exit with a non-zero status?

Cheers,
Patrick