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

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#!/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