Qemu startup options

Hi,

I'm currently trying to understand how parameters are used to call the obs worker virtual machine. If I run a local build via "osc build --vm-type kvm ..." the parameters are set by the code from the build package and script in:

/usr/lib/build/build-vm-kvm

If the build is done by the obs server backend it looks different and I thought how are the parameters defined when running your own OBS server ?

Can someone point me to the right direction ?

Thanks

Regards, Marcus