diskimage-builder/bin/disk-image-create

#!/bin/bash

set -e

SCRIPTNAME=$(basename $0)
export _LIB=$(dirname $0)/../lib
source $_LIB/die

function show_options () {
    echo "Options:"
    echo "    -a i386|amd64 -- set the architecture of the image"
    echo "    -o filename -- set the name of the output file" 
    echo "    -x -- turn on tracing"
    exit 0
}

TEMP=`getopt -o a:ho:x -n $SCRIPTNAME -- "$@"`
echo "XXX $TEMP"
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

while true ; do
    case "$1" in
        -a) export ARCH=$2; shift 2 ;;
        -o) export IMAGE_NAME=$2; shift 2 ;;
        -h) show_options;;
        -x) shift; set -x;;
        --) shift ; break ;;
        *) echo "Internal error!" ; exit 1 ;;
    esac
done
for arg do IMAGE_FLAVOUR="$IMAGE_FLAVOUR $arg" ; done

source $_LIB/img-defaults
source $_LIB/common-functions
source $_LIB/img-functions

echo "Building flavours: $IMAGE_FLAVOUR"
echo "If prompted for sudo, install sudoers.d/img-build-sudoers into /etc/sudoers.d and restart the build."
mkdir -p $IMG_PATH

# TODO: make a flavour.
ensure_nbd

mk_build_dir
ensure_base_available
eval_run_d block-device-size "IMAGE_SIZE="

qemu-img create -f qcow2 $TMP_IMAGE_PATH ${IMAGE_SIZE}G

# Should have a grab-next-dev helper ?
NBD_DEV=/dev/nbd0
if [[ $(qemu-nbd --help | grep cache) == *writeback* ]] ; then 
  CACHE="--cache=writeback"
else 
  echo "Warning: qemu-nbd without --cache=writeback is /slow/."
  CACHE=""
fi
sudo qemu-nbd -c $NBD_DEV $CACHE $TMP_IMAGE_PATH 
export EXTRA_UNMOUNT="sudo qemu-nbd -d $NBD_DEV"
export IMAGE_BLOCK_DEVICE=$NBD_DEV
eval_run_d block-device "IMAGE_BLOCK_DEVICE="

sudo mkfs -F -t $FS_TYPE -L cloudimg-rootfs ${IMAGE_BLOCK_DEVICE}

mount_tmp_image ${IMAGE_BLOCK_DEVICE}

create_base
run_d extra-data
do_pre_install
do_install
prepare_first_boot
finalise_base
unmount_image
compress_image
save_image $IMAGE_NAME.$IMAGE_TYPE