This is currently handled in the script wrapper before invoking pungi-koji.

If we are to implement this, it should be done in a generic way. Maybe adding a process_command key into the scm dict might work. Pungi would clone the git repo, run the command and only then copy the file.

what PR fixed this issue? clues on how to take advantage of it and remove the 'git clone' from our releng scripts?

@dustymabe looks to be https://pagure.io/pungi/c/cae202c17b0a34419313d9fe5095311c8419c729?branch=master

Here's an example snippet that I'm using for testing in stage:

comps_file = {
    'scm': 'git',
    'repo': 'https://pagure.io/fedora-comps.git',
    'file': 'comps-f26.xml',
    'command': 'make comps-f26.xml',
}