[Bug 1907713] [NEW] aufs support is deprecated and should be handled on upgrade

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

The Ubuntu kernel team has continued to carry aufs support as a sauce
patch but there is no known application for this filesystem anymore
except for docker deployments using this deprecated storage option.

We can't expect the kernel team to carry this deprecated filesystem
indefinitely merely because docker.io upstream hasn't provided a
migration path for existing installs.  If we can't do a smooth
conversion on upgrade of the docker.io package from aufs to another
storage backend, then at the very least we need to draw a line and block
the upgrades between releases.

So for hirsute we should make use of aufs in the docker config to result
in blocking the upgrade in preinst.

We should also add a quirk to ubuntu-release-upgrader, so that on
release upgrades this case can be detected before starting the upgrade
and causing maintainer script failures in the middle.

We don't really want this change to be SRUed back to prior releases, but
this is subject to being revisited if the focal HWE kernel needs to drop
aufs support.

** Affects: docker.io (Ubuntu)
     Importance: High
     Assignee: William Wilson (jawn-smith)
         Status: New

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
     Assignee: William Wilson (jawn-smith)
         Status: New

** Affects: docker.io (Ubuntu Hirsute)
     Importance: High
     Assignee: William Wilson (jawn-smith)
         Status: New

** Affects: ubuntu-release-upgrader (Ubuntu Hirsute)
     Importance: High
     Assignee: William Wilson (jawn-smith)
         Status: New


** Tags: fr-1000 patch
-- 
aufs support is deprecated and should be handled on upgrade
https://bugs.launchpad.net/bugs/1907713
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