#!/usr/bin/env bash
set -e
arch='x86_64'
while getopts a: OPT > /dev/null 2>&1; do
  case "$OPT" in
    'a')
      arch="$OPTARG"
      ;;
  esac
done
case "$arch" in
  'x86_64')
    defconfig='qemu_x86_64_defconfig'
  ;;
  'arm')
    # qemu_arm_vexpress_defconfig required a newer QEMU than 2.0.0 on a Ubuntu host.
    # so let's stick to versatile for now.
    defconfig='qemu_arm_versatile_defconfig'
  ;;
  'mips64')
    defconfig='qemu_mips64r6_malta_defconfig'
  ;;
esac

cd buildroot
for p in $(find '../buildroot_patches/' -maxdepth 1 -name '*.patch' -print); do
    patch -N -r - -p 1 <"$p" || :
done
outdir="output.${arch}~"
make O="$outdir" BR2_EXTERNAL="$(pwd)/../kernel_module" "$defconfig"
# TODO Can't get rid of this for now.
# http://stackoverflow.com/questions/44078245/is-it-possible-to-use-config-fragments-with-buildroots-config
cat ../buildroot_config_fragment >> "${outdir}/.config"
# HOST_QEMU_OPTS is a hack that happens to work because the QEMU package luckly uses += at all times.
# It shouldn't be necessary in the first place: https://bugs.busybox.net/show_bug.cgi?id=9936
# Even if were an autotools package, there is no general way currently to pass extra configs to it:
# https://stackoverflow.com/questions/44341188/how-to-pass-extra-custom-configure-autotools-options-to-a-buildroot-package/44341225#44341225
env \
  -u LD_LIBRARY_PATH \
  time \
  make \
  O="$outdir" \
  BR2_JLEVEL="$(($(nproc) - 2))" \
  HOST_QEMU_OPTS="--enable-debug --enable-sdl --extra-cflags='-DDEBUG_PL061=1' --with-sdlabi=2.0" \
  host-qemu-rebuild \
  linux-rebuild \
  all \
;
cd ..
./runqemu "$@"