Mini Shell

#!/usr/bin/bash

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

ARCH=$(uname -m)
# Older ppc64le OPAL firmware (petitboot version < 1.8.0) don't have BLS support
# so grub2-mkconfig has to be run to generate a config with menuentry commands.
if [[ $ARCH = "ppc64le" ]] && [ -d /sys/firmware/opal ]; then
    RUN_MKCONFIG=true
fi

if [[ $DISABLE_BLS = "true" ]]; then
    if grep -q '^GRUB_ENABLE_BLSCFG="*true"*\s*$' /etc/default/grub; then
	sed -i 's/^GRUB_ENABLE_BLSCFG=.*/GRUB_ENABLE_BLSCFG=false/' /etc/default/grub
    fi
fi

[ -f /etc/default/grub ] && . /etc/default/grub
if [ x$GRUB_ENABLE_BLSCFG = xfalse ]; then
   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"

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