[debian-mysql] Bug#792080: mysql-common: needs to handle upgrades from mariadb-common that creates my.cnf -> mariadb.cnf symlink

[Robie Basak]

Hi Andreas,

Some quick answers (without looking at detail):

On Fri, Jul 17, 2015 at 01:10:35PM +0200, Andreas Beckmann wrote:
> I pushed another one to deregister the my.cnf.fallback alternative on
> removal, otherwise purge gets noisy about the dangling link.

Having looked at your previous patches I feel that you have a better
grasp on this fix than I do and agree with the principle of your
proposed fix, so I'm happy to take your direction on this - both on the
patches and on coordination with mariadb. Please feel free to upload
from VCS as needed to fix this issue.

> In my tests with piuparts the upgrade paths now looks fine. Only people
> that track sid and use mariadb, i.e. that had upgraded to mysql-common
> 5.6.25-2, may end up with an unneccessary my.cnf.migrated (could be the
> pristine my.cnf from before the switch). It would be quite easy to
> detect this as well, we would just need a (list of) md5sums of the old
> pristine my.cnf to compare against.

We can do this later too, right?

> Will we have to adjust the versioning of the Breaks/Depends somehow to
> also cover Ubuntu properly?

mariadb in Ubuntu has never created the symlink. As it had the
mysql-common update-alternatives symlink code first, it didn't need it.
It was my error in understanding that this was blocking Otto in Debian
since mysql-common wasn't updated in Debian (jessie was in freeze at the
time we did it, and I neglected it after jessie was released).

I'll take a look before I update Ubuntu. I might just need to make sure
that the symlink is never deleted, or verify that the code won't ever do
that.

> And now we are moving slightly offtopic in this bug:

I'll take this off the bug and reply on the list.

Robie
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