[Bug 1490071] Re: MariaDB writes to /var/lib/mysql after crossgrade, preventing users from reverting to MySQL without manual intervention

[Robie Basak]

On Tue, Sep 01, 2015 at 01:38:26PM -0000, Otto Kekäläinen wrote:
> The bug is about the user experience: how users are notified what
> happens and how dpkg is aborted into a broken state.

I disagree. I'm treating this bug as tracking the fact that it cannot be
done, whereas I have proposed a mechanism by which it could be done.

I don't think it's acceptable for a crossgrade from MySQL to MariaDB to
take place in a way that cannot be reversed by MariaDB effectively
clobbering the MySQL packaging's data files, when otherwise removing and
re-installing the MySQL packaging only with no MariaDB involved would
work.

It is certainly non-trivial to fix in a way that works for everybody,
and we will need to talk more about how we can resolve this, but that
doesn't stop the issue from existing.


** Summary changed:

- MySQL 5.5/5.6 detects /var/lib/mysql/*.flag file and aborts installation
+ MariaDB writes to /var/lib/mysql after crossgrade, preventing users from reverting to MySQL without manual intervention

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Title:
  MariaDB writes to /var/lib/mysql after crossgrade, preventing users
  from reverting to MySQL without manual intervention

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