With Mock 2.4, it has now become possible to set an array of commands for configuring the modules active in a buildroot.

This is done by configuring the module_setup_commands option with a list of disable/enable commands accordingly, like this example for a mock config:

config_opts['module_setup_commands'] = [
        ('disable', 'php'),
        ('enable',  'php:7.4'),
]

These will be applied early so that build dependencies will be satisfied by the modular package set rather than some weird mix that is unreproducible or unworkable.

This is foundational for making EPEL properly functional for building against RHEL modules, and many third party package builders using Koji will need it to successfully build things properly.