diskimage-builder/diskimage_builder/elements/yum/pre-install.d/01-module-configuration

#!/bin/bash
#
# When building RHEL overcloud images, certain modules may be preferred
# or even required.
#
# For example, container-tools:2.0 is notably a requirement when running
# the Train releases on RHEL 8.2.
#

if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
    set -x
fi

set -eu
set -o pipefail

export DIB_DNF_MODULE_STREAMS=${DIB_DNF_MODULE_STREAMS:-}

if [ "${YUM}" =~ "dnf" ]; then
    for m in ${DIB_DNF_MODULE_STREAMS}; do
        ${YUM} -y module disable ${m/:*/}
        ${YUM} -y module enable ${m}
    done
fi