diskimage-builder/elements/redhat-common/pre-install.d/15-remove-grub

#!/bin/bash
if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

GRUBNAME=$(which grub-install) || echo "trying grub2-install"
if [ -z "$GRUBNAME" ]; then
    GRUBNAME=$(which grub2-install)
fi
if [ -z "$GRUBNAME" ] || [ $($GRUBNAME --version | grep -c "0.97") -ne 0 ]; then
    echo "No GRUB2 found. No need to remove"
    exit 0
else
# Must manually remove grub2 here, otherwise the download below does not work.
    yum remove -y grub2
fi

# Remove all old versions of grub2 from the yum cache and then ensure the
# latest version is in the cache.
basearch=$(cat /etc/yum/vars/basearch)
find /tmp/yum/$basearch -regex ".*/grub2-[0-9].*\.rpm" -exec rm -f {} +
install-packages -d grub2

# Copy grub2 rpm out of mounted yum cache for install during finalise
mkdir -p /tmp/grub
cp $(find /tmp/yum/$basearch -regex ".*/grub2-[0-9].*\.rpm") /tmp/grub
echo "rpm -i /tmp/grub/*.rpm" > /tmp/grub/install

#GRUB_CFG=/boot/grub2/grub.cfg

#[ -f "$GRUB_CFG" ]

# Update the config to have the search UUID of the image being built.
# When partition staging is moved to a separate stage, this will need to happen
# there. This generates a non-UUID config, which is irrelevant for booting with
# hypervisor kernel + ramdisk, and fixed up by 51-grub for vm images.
#GRUB_DISABLE_LINUX_UUID=true grub2-mkconfig -o $GRUB_CFG