diskimage-builder/diskimage_builder/elements/centos/post-install.d/03-reset-bls-entries

#!/bin/bash

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

if [[ ! '9-stream' =~ ${DIB_RELEASE} ]]; then
    exit 0
fi

# This is a workaround for the grub issue reported upstream with
#  https://bugzilla.redhat.com/show_bug.cgi?id=2032680

# This renames the BLS entries from the upstream .qcow2 image in
# /boot/loader/entries with the current machine-id. This means that in the
# bootloader setup, grub2-mkconfig will update config options as required.

pushd /boot/loader/entries

machine_id=$(</etc/machine-id)

for entry in *.conf; do
    new_entry=$(echo $entry | sed "s/^[a-f0-9]*/$machine_id/")
    echo "renaming $entry to $new_entry for new machine-id"
    if [[ $entry != $new_entry ]]; then
        mv $entry $new_entry
    fi
done
popd

echo "--- Show kernels ---"
grubby --info=ALL