livecd-rootfs/live-build/ubuntu-cpc/hooks/032-disk-image.binary

#!/bin/bash -eux
architecture=$(chroot chroot dpkg --print-architecture)
if [ "$architecture" = "ppc64el" ]; then
    echo "ppc64el disk images are handled separately"
    exit 0
fi

. /build/config/functions

create_empty_partition() {
    apt-get install -qqy parted
    parted_prefix="parted $1 --script --"

    ${parted_prefix} mklabel msdos
    ${parted_prefix} mkpart primary 1 -1
    ${parted_prefix} set 1 B
    ${parted_prefix} print
    ${parted_prefix} align-check opt 1
}

disk_image=binary/boot/disk.ext4

create_empty_disk_image "${disk_image}"
create_empty_partition "${disk_image}"
mount_image "${disk_image}"

# Copy the chroot in to the disk
make_ext4_partition "${rootfs_dev_mapper}"
mkdir mountpoint
mount "${rootfs_dev_mapper}" mountpoint
cp -a chroot/* mountpoint/
umount mountpoint
rmdir mountpoint

should_install_grub() {
    case $architecture in
        armhf|arm64)
            return 1
            ;;
        *)
            return 0
            ;;
    esac
}

if should_install_grub; then
    mkdir mountpoint
    mount_partition "${rootfs_dev_mapper}" mountpoint

    echo "(hd0) ${loop_device}" > mountpoint/tmp/device.map
    chroot mountpoint grub-install ${loop_device}
    chroot mountpoint grub-bios-setup --boot-image=i386-pc/boot.img --core-image=i386-pc/core.img --skip-fs-probe --device-map=/tmp/device.map ${loop_device}

    rm mountpoint/tmp/device.map
    umount_partition mountpoint
    rmdir mountpoint
fi

clean_loops
trap - EXIT