✏ EDIT: 99-grub-mkconfig.install

#!/bin/bash

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

ARCH=$(uname -m)

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

# Assume GRUB_ENABLE_BLSCFG is true if
# GRUB_ENABLE_BLSCFG is not set, e.g. /etc/default/grub does not exist
# GRUB_ENABLE_BLSCFG is set to true
if [[ x$GRUB_ENABLE_BLSCFG != xfalse ]]; then
    # Can't assume a BLS capable bootloader on ppc64
    if [[  $ARCH = "ppc64" || $ARCH = "ppc64le" ]]; then
	RUN_MKCONFIG="true"
    fi
else
    RUN_MKCONFIG="true"
fi

# A traditional grub configuration file needs to be generated only in the case when
# the bootloaders are not capable of populating a menu entry from the BLS fragments.
if [[ $RUN_MKCONFIG != "true" ]]; then
    exit 0
fi

COMMAND="$1"

grub_cfg=/boot/grub2/grub.cfg
if mountpoint -q /boot/efi; then
    os_name=$(grep ^ID= /etc/os-release | sed -e 's/^ID=//' -e 's/rhel/redhat/' -e 's/\"//g')
    grub_cfg=/boot/efi/EFI/$os_name/grub.cfg
fi

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

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