[debian-mysql] Bug#790249: [Re:] mysql-server: Upgrade 5.5 to 5.6 fails

[C. Dominik Bódi]

Indeed, after installing systemd on that machine and booting with 
init=/bin/systemd the upgrade was successful.

The error does seem to get triggerred by /etc/init.d/mysql
when starting manually, the script complains somewhat cryptically about not 
finding the HOME dir and setting HOME=/

The daemon does start, though but I guess apt sees it as an error and thinks 
mysql was not started successfully.

When using systemd, the init script is not used and mysql_safe is started 
directly using the provided systemd service file 
/lib/systemd/system/mysql.service

It seems the upgrade path doesn't work when there is the old sysvrc init 
installed, so mysql-server-5.6 should either explicitly depend on systemd or 
the init script needs to be modified.

Regards,
Dominik
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