diskimage-builder/diskimage_builder/elements/yum/extra-data.d/99-yum-repo-conf

#!/bin/bash
# Add additional yum repo configuration(s) with $DIB_YUM_REPO_CONF

if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

# exit directly if DIB_YUM_REPO_CONF is not defined properly
if [ -z "${DIB_YUM_REPO_CONF:-}" ] ; then
    echo "DIB_YUM_REPO_CONF is not set - no repo configuration will be copied in"
    exit 0
fi

for file in $DIB_YUM_REPO_CONF; do
    if [ ! -f $file ]; then
        echo "$file is not a valid yum repo configuration file."
        echo "You should assign a list of proper yum repo configuration"
        echo "files in DIB_YUM_REPO_CONF."
        exit 1
    fi

    # copy the yum repo configuration
    sudo cp -L -f $file $TMP_MOUNT_PATH/etc/yum.repos.d

done