[Bug 1490071] Re: MariaDB writes to /var/lib/mysql after crossgrade, preventing users from reverting to MySQL

[Robie Basak]

On Tue, Sep 01, 2015 at 01:03:47PM -0000, Otto Kekäläinen wrote:
> Robie, sorry but you've understood this all wrong. I hope to clarify the
> status now.

Sorry. Let's work through this.

I thought it was fundamentally not supported to crossgrade a directory
from mariadb-10.0 to mysql-5.6? So I don't see how the flags thing comes
into this. So let's start here. Am I mistaken? Is there an
upstream-supproted path for getting from a /var/lib/mysql that is
running on MariaDB 10.0 to a /var/lib/mysql that is running on MySQL
5.6? If not upstream-supported, is it something we can do automatically
in distro packaging that will result in something that is upstream
supported again?

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https://bugs.launchpad.net/bugs/1490071

Title:
  MySQL 5.5/5.6 detects /var/lib/mysql/*.flag file and aborts
  installation

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