#!/bin/bash

# Based on boot-x86
#
# Do install stuff for arm64, including making bootable CDs
# Works with debian-installer
#
# $1 is the CD number
# $2 is the temporary CD build dir

. $BASEDIR/tools/boot/$DI_CODENAME/common.sh

set -e
#set -x

N=$1
CDDIR=$2
BOOTDIR=
INSTALLDIR="install.a64"
if [ "$DI_WWW_HOME" = "default" ];then
    DI_WWW_HOME="http://d-i.debian.org/daily-images/arm64/daily"
    try_di_image_cache
fi

case "$MKISOFS" in
    *xorriso*)
        XORRISO_VER=$(xorriso_version)
        ;;
    *)
        echo "ERROR: debian-cd depends on xorriso for making arm64 bootable CDs."
        exit 1;
        ;;
esac

cd $CDDIR/..

# This script is called with $1 (now $N) as the CD to make bootable.
# N may be in the form "n" or "n_NONUS" There may be more than 4
# disks...support extras.

# Strip NONUS part of disk number
# NN will be 1...N so it can be used as an index
NN=`echo $N | sed -e 's/_NONUS//'`

# Exit if this is not a boot disk
if [ $NN != 1 ] ; then exit 0; fi

BOOT_IMAGES="cdrom/initrd.gz cdrom/vmlinuz cdrom/debian-cd_info.tar.gz"

# Download boot images.
for image in $BOOT_IMAGES; do
    if [ ! -e "$image" ]; then
        dir=$(dirname $image)
        mkdir -p $dir
        if [ -n "$LOCAL"  -a -f "${LOCALDEBS:-$MIRROR}/dists/$DI_DIST/local/installer-$ARCH/current/images/$image" ]; then
            cp "${LOCALDEBS:-$MIRROR}/dists/$DI_DIST/local/installer-$ARCH/current/images/$image" "$image"
        elif [ ! "$DI_WWW_HOME" ];then
            if [ ! "$DI_DIR" ];then
                DI_DIR="$MIRROR/dists/$DI_DIST/main/installer-$ARCH/current/images"
            fi
            cp "$DI_DIR/$image" "$image"
        else
            wget "$DI_WWW_HOME/$image" -O "$image"
        fi
    fi
done

# Boot setup including config and help files comes from d-i.
mkdir -pv $PWD/boot$N
cat cdrom/debian-cd_info.tar.gz | (cd boot$N/; tar zx)

# Common mkisofs options when creating CDs
add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-J -joliet-long"
add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-cache-inodes"

# We explicitly put the boot bits in boot$N (as opposed to CD$N) and
# list it first on the eventual mkisofs command line. That means
# they'll be placed nearer the front of the eventual image; some older
# BIOSes apparently have a limitation on what they'll boot here.
add_mkisofs_opt $CDDIR/../$N.mkisofs_dirs "boot$N"

if [ -d boot$N/grub ] ; then
    echo "  Adding EFI boot code for $ARCH on CD$N"

    # Move GRUB files to the right place.
    mkdir -p $CDDIR/efi/boot
    mcopy -i boot$N/grub/efi.img ::efi/boot/bootaa64.efi $CDDIR/efi/boot/bootaa64.efi
    mkdir -p $CDDIR/boot/grub
    mv boot$N/grub/* $CDDIR/boot/grub/
    rmdir boot$N/grub

    # Stuff the EFI boot files into a FAT filesystem, making it as
    # small as possible.  24KiB headroom seems to be enough;
    # (x+31)/32*32 rounds up to multiple of 32.
    # This is the same as in efi-image, but we need to redo it here in
    # the case of a multi-arch image

    size=0
    for file in $CDDIR/efi/boot/boot*.efi; do
        size=$(($size + $(stat -c %s "$file")))
    done

    blocks=$((($size / 1024 + 55) / 32 * 32 ))

    rm -f $CDDIR/boot/grub/efi.img
    mkfs.msdos -C "$CDDIR/boot/grub/efi.img" $blocks >/dev/null
    mmd -i "$CDDIR/boot/grub/efi.img" ::efi
    mmd -i "$CDDIR/boot/grub/efi.img" ::efi/boot
    mcopy -i "$CDDIR/boot/grub/efi.img" $CDDIR/efi/boot/boot*.efi \
        "::efi/boot"

    # Ugh - different code here depending on the version of xorriso we've got
    if [ $XORRISO_VER -le 10202 ] ; then
        # 1.2.2 shipping in Wheezy
        echo "Using older EFI command line for xorriso $XORRISO_VER"
        # Tell xorriso to create a secondary ElTorito boot record for the
        # EFI bootloader
        add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-eltorito-alt-boot --efi-boot boot/grub/efi.img"
        # Add the efi image as a FAT partition too, so our CD image will
        # also boot on a USB key (like isohybrid, just implemented
        # differently)
        add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-append_partition 2 0x01 $CDDIR/boot/grub/efi.img"
        
    elif [ $XORRISO_VER -gt 10202 ] ; then
        echo "Using newer EFI support in xorriso $XORRISO_VER"
        add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot"
    fi      
else
    echo "  No EFI boot code for $ARCH on CD$N"
fi

# th,th, thats all