On Fri, 12 May 2017 11:26:13 +0200 Ondřej Surý <ond...@sury.org> wrote:
> Dear release team and fellow MySQL/MariaDB maintainers, > > the situation in stretch in regards to clean upgrade path from jessie > is a little bit unfortunate. It works for most cases when something > depends on default-mysql-server and pulls it as a dependency. But in > situations where mysql-server was the top dependency, it simply > uninstalls mysql-server-5.5 without any replacement. > > I understand the reasons why we are here, but the situation where user > needs to do: > apt-get update > # apt-get upgrade > apt-get install default-mysql-server > apt-get dist-upgrade > > is very inconvenient for the users and I foresee this will cause a lot > of complaints, because it's quite common to run just "mysql-server" on > the server. > > Therefore I am proposing a one time fix specifically targeted at > stretch. I would like to prepare 'mysql-transitional' package that > will create a couple of dummy/transitional packages structured like > this: > > mysql-server depends on default-mysql-server > mysql-client depends on default-mysql-client > > The version would be 5.5.999+mariadb, so it is always higher than > version in jessie, but always lower than version in sid, as I don't > want force epoch on mysql-5.7. I agree that this sounds like it will work for stretch, and it's much better than bumping epoch on mysql-5.7. As you say, it's a one time fix, but I'm a bit concerned about what happens when those packages again are provided by MySQL. Let's think through what will happen in buster. There are three options: 1) Buster contains only MariaDB. Will these packages also be in buster? If not, what happens on upgrade from stretch to buster? Will we have the same problem again? 2) Buster contains both MySQL and MariaDB. MariaDB is default. The mysql-server and mysql-client packages are provided by MySQL, but default-mysql-server and default-mysql-client point to MariaDB. How will the upgrade go? Some users have installed mysql-server or mysql-client explicitly, while others have installed a different package that depends on default-mysql-server or default-mysql-client. 3) Buster contains both MySQL and MariaDB. MySQL is default. The mysql-server and mysql-client packages are provided by MySQL, and the default-mysql-server and default-mysql-client packages point to MySQL. I assume the dist-upgrade will move users back to MySQL, but will there be other problems? We should think through these scenarios so that we're sure we're not creating bigger problems for ourselves in the future. Best regards, Norvald H. Ryeng
