Comment 28 for bug 1661869

Sure thing!

I conducted two tests based on the reproduction steps in the SRU template

 * setup lxd (apt install lxd, lxd init, get working networking)
 * lxc launch ubuntu:16.04 avahi-test --config security.privileged=true
 * lxc exec avahi-test sudo apt install avahi-daemon

For xenial, artful versions I installed a container, installed the current package and then verified that it failed to install/start as expected. I then removed that container, created a fresh container, enabled -proposed and tested the install again to ensure it succeeded with the new version. I then further installed avahi-utils and executed "avahi-browse -a" to ensure services from the network were appearing and that the /etc/avahi/avahi-daemon.conf file had changed as expected based on the patch (which was the only change, there are no code changes).

For trusty I conducted the same tests however the initial package install does not fail under LXD due to a patch within the trusty version of avahi that skips the nproc rlimit when inside containers for reasons that no longer apply to modern lxd versions, however I did still ensure the avahi-daemon.conf file was updated as expected. The patch is still required on trusty because a host that has containers on it, will still have the problem with the avahi instance on the host itself that still has the rlimit applied (even though the containers themselves don't see the issue).

Lastly for each version I also installed the broken version and tested that an upgrade also went as expected rather than fresh install for completeness.

Hope that helps.