Hi Thomas,
(adding the bug to CC as there's no reason to contact me personally).
On Thu, Mar 15, 2012 at 08:38:56PM +0800, Thomas Goirand wrote:
> I am very concerned by #476946. It's affecting a lot of packages:
> - phpmyadmin
> - roundcube
> - keystone
> - etc.
>
> I had a look, and I can't really find how dbconfig works. As I
> understand, everything is in dpkg/*, right? But then, how does it work?
> Can you describe it a bit, so that I can find faster where the issue is?
> Or maybe you can try to find the reason why there is #476946?
For starters, I suggest you read through the documentation. There is
a design document shipped in the package :)
The problem in this case is that, by design, dbconfig-common is nuking
all debconf settings before each run because "Debconf is not a registry",
and Really Bad Things can happen to other people who are *not* pre-seeding
if we allow the debconf settings to persist between installs/upgrades/etc.
If you want to make pre-seeding work, without dropping the files in place
ahead of time (which seemed to have unrelated problems, though my memory
is pretty hazy on this topic by now), I think you'll have to patch
dbconfig-common to:
* accept a new debconf flag (let's call it
"dbconfig-common/debconf_is_a_registry").
* find the portions of the code where the debconf settings are nuked, and;
* make it conditional based on this new debconf value.
* nuke the value of this new debconf setting immediately afterwards.
* add mention of this behavior to the design document.
* add mention of this feature to the developer "using" guide.
If you or someone else is feeling particularly adventurous I'm happy to
review a proposed change that does the above (or if you can motivate a
better way to do it by all means be my guest). If you want bonus l33t
points, there is a shunit based test framework which could use a test
case for the same, though I wouldn't be so mean as to force you to figure
that out as a pre-condition :)
sean
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