#!/usr/bin/env bash
set -o errexit
set -o nounset
set -o pipefail
# set -o xtrace

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 
   exit 1
fi

file_exists() {
    [[ -f $1 ]];
}

__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
__file="${__dir}/$(basename "${BASH_SOURCE[0]}")"
__base="$(basename ${__file} .sh)"

MOUNT_POINT="${__dir}/root_mount"
OVERWRITE_FILES_BEFORE_INIT_DIR="${__dir}/overwrite_before_init"
OVERWRITE_FILES_AFTER_INIT_DIR="${__dir}/overwrite_after_init"

if [ ! -f kernel-qemu ] || ! file_exists *raspbian*.img ; then
    ./posbox_download_images.sh
fi

cp -a *raspbian*.img posbox.img

CLONE_DIR="${OVERWRITE_FILES_BEFORE_INIT_DIR}/home/pi/odoo"
mkdir "${CLONE_DIR}"
git clone -b 8.0 --no-checkout --depth 1 https://github.com/odoo/odoo.git "${CLONE_DIR}"
cd "${CLONE_DIR}"
git config core.sparsecheckout true
echo "addons/web
addons/web_kanban
addons/hw_*
addons/point_of_sale/tools/posbox/configuration
openerp/
odoo.py" | tee --append .git/info/sparse-checkout > /dev/null
git read-tree -mu HEAD
cd "${__dir}"

LOOP_MAPPER_PATH=$(kpartx -av posbox.img | tail -n 1 | cut -d ' ' -f 3)
LOOP_MAPPER_PATH="/dev/mapper/${LOOP_MAPPER_PATH}"
mkdir "${MOUNT_POINT}"
mount "${LOOP_MAPPER_PATH}" "${MOUNT_POINT}"

# 'overlay' the overwrite directory onto the mounted image filesystem
cp -a "${OVERWRITE_FILES_BEFORE_INIT_DIR}"/* "${MOUNT_POINT}"

# get rid of the git clone
rm -rf "${CLONE_DIR}"

# get rid of the mount, we have to remount it anyway because we have
# to "refresh" the filesystem after qemu modified it
sleep 2
umount "${MOUNT_POINT}"

# from http://paulscott.co.za/blog/full-raspberry-pi-raspbian-emulation-with-qemu/
# ssh pi@localhost -p10022
QEMU_OPTS=(-kernel kernel-qemu -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial stdio -append 'root=/dev/sda2 panic=1 rootfstype=ext4 rw' -hda posbox.img -net user,hostfwd=tcp::10022-:22,hostfwd=tcp::18069-:8069 -net nic)
if [ -z ${DISPLAY:-} ] ; then
    QEMU_OPTS+=(-nographic)
fi
qemu-system-arm "${QEMU_OPTS[@]}"

mount "${LOOP_MAPPER_PATH}" "${MOUNT_POINT}"
cp -av "${OVERWRITE_FILES_AFTER_INIT_DIR}"/* "${MOUNT_POINT}"

# cleanup
sleep 2
umount "${MOUNT_POINT}"
rm -r "${MOUNT_POINT}"

echo "Running zerofree..."
zerofree -v "${LOOP_MAPPER_PATH}" || true

kpartx -d posbox.img