debug old init.d script on Jessie with systemd

[Thomas Koch]

Hi,

I want to know, why sleepd (debian package) does not start. Before systemd I 
put a set -x on top of the init.d script and look where the script exits.

Now the script exits in some systemd lsb script.

How can I get more info what's going on?

Where do I find a tutorial for Debian Maintainers about how systemd works and 
how packaging is different with systemd?

Thank you,

Thomas Koch