#!/usr/bin/env bash
set -e

CONTAINER_NAME=kindle_go_builder
WORKDIR=/src
OUTFILE=kindle_fbink_go

if ! docker ps -a --format '{{.Names}}' | grep -q "^${CONTAINER_NAME}\$"; then
  echo "[sh] Creating container"
  docker run -dit --name ${CONTAINER_NAME} debian:bookworm sleep infinity
fi

echo "[sh] Installing toolchain inside container"
docker exec ${CONTAINER_NAME} bash -c "
  set -e
  apt-get update
  apt-get install -y golang-go curl xz-utils build-essential gcc-arm-linux-gnueabi g++-arm-linux-gnueabi
  if [ ! -d /usr/local/arm-linux-musleabi-cross ]; then
    echo '[sh] Downloading musl cross toolchain...'
    cd /usr/local
    curl -L https://musl.cc/arm-linux-musleabi-cross.tgz | tar xz
  fi
"

echo "[sh] Copying project into container"
docker exec ${CONTAINER_NAME} rm -rf ${WORKDIR}
docker cp ./go ${CONTAINER_NAME}:${WORKDIR}

echo "[sh] Building for ARMv7 soft-float (musl static)"
docker exec ${CONTAINER_NAME} bash -c "
  set -e
  export PATH=/usr/local/arm-linux-musleabi-cross/bin:\$PATH
  cd ${WORKDIR}
  export GOOS=linux GOARCH=arm GOARM=5 CGO_ENABLED=1 CC=arm-linux-gnueabi-gcc
  go build -ldflags '-linkmode external -extldflags "-static"' -o kindle_fbink_go .
"

echo "[sh] Copying binary back to hsot"
docker cp ${CONTAINER_NAME}:${WORKDIR}/${OUTFILE} ./${OUTFILE}

echo "[sh] Build complete: ${OUTFILE}"