This is the point were exclude is added to the fedora-28 dib
https://github.com/openstack/diskimage-builder/blob/37dff9738afd245772cf029995476f29e68fb0f0/diskimage_builder/elements/pip-and-virtualenv/install.d/pip-and-virtualenv-source-install/04-install-pip#L188
This is the point were exclude is added to the fedora-28 dib
https:/ /github. com/openstack/ diskimage- builder/ blob/37dff9738a fd245772cf02999 5476f29e68fb0f0 /diskimage_ builder/ elements/ pip-and- virtualenv/ install. d/pip-and- virtualenv- source- install/ 04-install- pip#L188