#!/bin/bash

if ! [[ $KERNEL_INSTALL_MACHINE_ID ]]; then
    exit 0
fi

# A "control_d" string in /proc/xen/capabilities indicates that is a Xen Dom0 host.
[[ -e /sys/hypervisor/type ]] && read HV_TYPE < /sys/hypervisor/type
[[ -e /proc/xen/capabilities ]] && grep -q "control_d" /proc/xen/capabilities && XEN_DOM0=true

if [[ $HV_TYPE = "xen" && $XEN_DOM0 != "true" ]]; then
    RUN_MKCONFIG=true
    if grep -q '^GRUB_ENABLE_BLSCFG="*true"*\s*$' /etc/default/grub; then
	sed -i 's/^GRUB_ENABLE_BLSCFG=.*/GRUB_ENABLE_BLSCFG=false/' /etc/default/grub
    fi
fi

ARCH=$(uname -m)
if [[ $ARCH = "ppc64le" ]]; then
    RUN_MKCONFIG=true
fi

# A traditional grub configuration file needs to be generated only for ppc64le and
# Xen DomU guests since we can't assume that bootloaders will be BLS capable there.
if [[ $RUN_MKCONFIG != "true" ]]; then
    exit 0
fi

[[ -f /etc/default/grub ]] && . /etc/default/grub

COMMAND="$1"

case "$COMMAND" in
    add|remove)
        grub2-mkconfig --no-grubenv-update -o /boot/grub2/grub.cfg >& /dev/null
        ;;
    *)
        ;;
esac