[Users] What is the best way to debug a VDSM hook?

I installed the hook smbios but it doesn't seem to be working. I was told earlier I needed to create a custom property to pass the data but that doesn't seem to be working. Not sure what I am doing wrong. I am looking for debugging hints on how to show what is being passed to the hook to confirm it is grabbing the correct info and what is being passed back to vdsm? http://gerrit.ovirt.org/gitweb?p=vdsm.git;a=tree;f=vdsm_hooks/smbios;h=c61ce... Thanks Robert