#!/bin/bash
#
# Copyright 2014 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

set -eu
set -o pipefail

echo Installing Boot Loader
if [[ "aarch64 armhf" =~ "$(uname -m)" ]]; then
    KERNEL_RELEASE="$(uname -r)"
    KERNEL="/boot/vmlinuz-$KERNEL_RELEASE"
    RAMDISK="/boot/initrd.img-$KERNEL_RELEASE"
    FILE="/boot/boot.cmd"
    #this file will contain script with boot parameters like ramdisk and kernel
    #address and console parameters. This varies from arm board to board, User
    #will provide boot script.
    if [ -f "$FILE" ] ; then
        #boot.scr file is created by below command which requires u-boot-tools package.
        mkimage -C none -A arm -T script -d "$FILE" /boot/boot.scr
    else
        echo "$FILE file not found to generate boot.scr"
    fi

else
    grub_bin=$(which grub)
    if [ -n "$grub_bin" ] ; then
        grub_ver="$($grub_bin --version | grep 0\.97)"
        if [ -n "$grub_ver" ] ; then
            echo "Legacy grub 0.97 found"
            $grub_bin --batch << EOF
root (hd0,0)
setup (hd0)
EOF
        else
            echo "unknown legacy grub version"
        fi
    else
        # Some distros have grub2 binaries named as grub2-install, grub2-mkconfig, etc.
        # Others have grub-install, grub-mkconfig, etc..
        grub_bin_prefix="grub"
        grub_bin="$(which ${grub_bin_prefix}-mkconfig)"
        if [ -n "${grub_bin}" ] ; then
            grub_bin_prefix="grub2"
            grub_bin="$(which ${grub_bin_prefix}-mkconfig)"
        fi
        if [ -n "$grub_bin" ] ; then
            grub_ver="$($grub_bin --version | grep 2\...)"
            if [ -n "$grub_ver" ] ; then
                echo "GRUB 2.xx found"
                ${grub_bin_prefix}-mkconfig -o /boot/${grub_bin_prefix}/grub.cfg
                ${grub_bin_prefix}-install --force /dev/sda
            else
                echo "unknown grub version"
            fi
        fi
    fi

fi