Comment 2 for bug 1670340

one option would be to make the root of git_repo URL customizable, so it could be overriden with single extra-var.

But I suspect every 'internal' mirror layout might be different, so there might not be a lot of sense to do this in bifrost.

Instead, best way might be to just populate a separate yaml file with all *_git_url vars pointing to the repos you need (may be with branches vars overriden there too, for donwstream branches... :) ), and just pass this file to ansible as extra vars like

  ansible-playbook ... -e @my-git-repos.yaml