#!/bin/bash

# Synopsis: list_bootloader_targets
#
# This function lists all disks and the root-partition if it is suitable to install a bootloader on it.
# Output example:
#   /dev/sda 250059350016 Master Boot Record
#   /dev/sdb 400088457216 Master Boot Record
#   /dev/sdb1 60003385344 Rootpartition (filesysem ext4)
function list_bootloader_targets()
{
    if [ -d /sys/firmware/efi ]; then
        root_disk="$(get_disk "$(hdmap_get device of mountpoint /)")"
        for efi_part in $(list_efi_partitions | grep "$root_disk"; list_efi_partitions | grep -v "$root_disk")
        do
            echo "$efi_part $(blockdev --getsize64 $efi_part) EFI partition"
        done
    else
        for disk in $(list_all_disks)
        do
                echo "$disk $(blockdev --getsize64 $disk) Master Boot Record"
        done
	root_dev="$(hdmap_get device of mountpoint /)"
	root_fs="$(hdmap_get filesystem of mountpoint /)"
        [ -z "$root_fs" ] && root_fs=$(get_filesystem "$root_dev")
        case $root_fs in
        reiserfs|ext2|ext3|ext4)
                list_linux_partitions | grep -q "^$root_dev$" &&
                echo "$root_dev $(blockdev --getsize64 $root_dev) Rootpartition (filesystem $root_fs)"
                ;;
        esac
    fi
}

function send_bootloader_targets()
{
	send data bootloader_targets
	list_bootloader_targets
}

# Synopsis: list_bootloaders
#
# This function lists all available bootloaders
# Output example:
#   BURG - Brand-new Universal loadeR from GRUB
#   GRUB - GRand Unified Bootloader
function list_bootloaders()
{
        for bl in burg grub
        do
                [ -x /usr/sbin/$bl-install ] || continue
                case $bl in
                burg) echo "BURG - Brand-new Universal loadeR from GRUB";;
                grub) echo "GRUB - GRand Unified Bootloader";;
                esac
        done
}

function send_bootloaders()
{
	send data bootloaders
	list_bootloaders
}

function install_bootmanager_to_target()
{
    send install_step install_bootmanager_to_target
    # force initrd update
    chroot_it update-initramfs -utk all &>/dev/null

    case "$cfg_bootloader" in
    grub)
        install_grub
        ;;
    burg)
        install_burg
        ;;
    esac
}

function install_grub()
{
    rm -f $TARGET/boot/vmlinuz $TARGET/boot/System.map $TARGET/boot/initrd.img

    apple=0
    # TODO Apple detection, e.g. using dmidecode
    false && apple=1

    # install grub
    mkdir -p "$TARGET/boot/grub"
    if [ -d /sys/firmware/efi ]; then
        if is_removeable "$cfg_bootloader_target" && [ "$apple" = 1 ]; then
            chroot_it grub-install --removeable &>/dev/null
        else
            chroot_it grub-install &>/dev/null
        fi
    else
        grub-install --recheck --no-floppy --root-directory=$TARGET "$cfg_bootloader_target" &>/dev/null || \
        grub-install --force --recheck --no-floppy --root-directory=$TARGET "$cfg_bootloader_target" &>/dev/null

        # preseed grub-pc with install-target
        for path in /dev/disk/by-id/*
        do
            [ -e "$path" ] || continue
            if [ "$(readlink -f "$path")" = "$(readlink -f "$cfg_bootloader_target")" ]; then
                echo "grub-pc grub-pc/install_devices multiselect $path" | chroot_it debconf-set-selections &>/dev/null
            break
        fi
        done
    fi
    
    write_kernel_img_conf

    # gfx=auto hack
    grep -q gfx=auto /proc/cmdline && chroot_it sed -i 's/\(^GRUB_CMDLINE_LINUX_DEFAULT=\).*/\1"quiet rw gfx=auto"/;s/\(^GRUB_CMDLINE_LINUX=\).*/\1""/' /etc/default/grub

    # update grub
    chroot_it update-grub &>/dev/null
    DEBIAN_FRONTEND=noninteractive chroot_it dpkg-reconfigure grub-pc &>/dev/null
    
    return 0
}

function install_burg()
{
    rm -f $TARGET/boot/vmlinuz $TARGET/boot/System.map $TARGET/boot/initrd.img

    # install burg
    mkdir -p "$TARGET/boot/burg"
    burg-install --recheck --no-floppy --root-directory=$TARGET "$cfg_bootloader_target" &>/dev/null || \
    burg-install --force --recheck --no-floppy --root-directory=$TARGET "$cfg_bootloader_target" &>/dev/null

#    # create device.map and save it to target
#    export device_map=$TARGET/tmp/device.map
#    get_device_map > $device_map
#    cat $device_map > $TARGET/boot/burg/device.map
#    rm -f $device_map

    # preseed burg-pc with install-target
    for path in /dev/disk/by-id/*
    do
    	[ -e "$path" ] || continue
    	if [ "$(readlink -f "$path")" = "$(readlink -f "$cfg_bootloader_target")" ]; then
            echo "burg-pc burg-pc/install_devices multiselect $path" | chroot_it debconf-set-selections &>/dev/null
	    break
	fi
    done
    
    write_kernel_img_conf

    # update burg
    chroot_it update-burg &>/dev/null
    DEBIAN_FRONTEND=noninteractive chroot_it dpkg-reconfigure burg-pc &>/dev/null
    
    return 0
}

function write_kernel_img_conf()
{
rm -f $TARGET/etc/kernel-img.conf
cat << EOT > $TARGET/etc/kernel-img.conf
# Kernel image management overrides
# See kernel-img.conf(5) for details
do_symlinks = yes
relative_links = yes
do_bootloader = no
do_bootfloppy = no
do_initrd = yes
link_in_boot = no
postinst_hook = update-$cfg_bootloader
postrm_hook   = update-$cfg_bootloader
EOT
}