[chef] Manage role-node association with scm?

[Tommaso Visconti < >]

Hi all,
I'm a newbie with Chef, just started the last week, hope this is a smart 
question :)

I really like the possibility to manage the infrastructure using GIT, 
but I'm not understanding how to save the relationships between nodes 
and their roles in the chef-repo. What I'm doing now to add a role to a 
node is:

knife node run_list add <mynode> "role[cool_role]"

but this doesn't leave any trace in the chef-repo files, so it's 
impossible to save the associations in the SCM.
Is it possible to use ruby/json files to manage the nodes' roles? Or the 
only ways are knife and the chef-server web interface?

I tried to solve the problem reading the docs, but they are really a lot 
and I didn't find anything useful for this :|

Thanks!