[debian-mysql] Bug#842011: Bug#842011: default-mysql-client forces removal of mysql-server* and mysql-client*

[Robie Basak]

Hi Craig,

On Tue, Oct 25, 2016 at 08:01:26PM +1100, Craig Sanders wrote:
> it's somewhat surprising that a package called default-mysql-client should
> force the removal of both mysql-client and mysql-server packages.

Please could you explain your use case? What are you trying to do at a
high level and why?

I agree that it's surprising that installing mariadb-client-10.0 forces
the removal of mysql-server-5.7. This appears to be because
mysql-server-5.7 depends on mysql-client-5.7.

Lars, do you know why this is necessary? Is this something we can drop?

> mariadb is NOT a drop-in replacement for mysql.

It does, however, take over various binary paths, so the equivalent
(server<->server, client<->client) packages must conflict, or the
MariaDB packaging needs to rename all the "mysql" names to "mariadb"
names, or the MySQL packaging needs to stop using any "mysql" names, or
we need extreme update-alternatives work. I don't see any other options.

The Debian MySQL maintainers team has always taken the first approach
(they conflict so a particular system can have MariaDB or MySQL but not
both). I don't believe we have any intention of changing this, but if
you think we should, perhaps we should track that in a separate bug.

Separately, MySQL will be leaving testing shortly, so I'm surprised that
you care. See bug 837615.

You said:

> default-mysql-client forces removal of mysql-server* and mysql-client*

Forcing the removal of mysql-server* seems to me to be surprising, so
I'll leave this bug open to look into that.

Forcing the removal of mysql-client* is by design, so this is "wontfix"
without further discussion. If you want to take this further then please
could you file a separate bug for that ("mysql-client-* conflicts with
mariadb-client-*), so we can distinguish between the different root
causes? It will immediately be a wontfix but I welcome technically
feasible arguments to have that changed.

Robie
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