#!/usr/bin/env bash

set -euo pipefail

if  [[ -z "${BABASHKA_STATIC:-}" ]]; then
    echo "BABASHKA_STATIC wasn't set, skipping musl installation."
    exit 0
fi

if [[ -z "${BABASHKA_MUSL:-}" ]]; then
    echo "BABASHKA_MUSL wasn't set, skipping musl installation."
    exit 0
fi

if [[ "${BABASHKA_ARCH:-"x86_64"}" != "x86_64" ]]; then
    echo "GraalVM only supports building static binaries on x86_64."
    exit 1
fi

apt-get update -y && apt-get install musl-tools -y

ZLIB_VERSION="1.2.12"
ZLIB_SHA256="91844808532e5ce316b3c010929493c0244f3d37593afd6de04f71821d5136d9"

curl -O -sL --fail --show-error "https://zlib.net/zlib-${ZLIB_VERSION}.tar.gz"

echo "${ZLIB_SHA256} zlib-${ZLIB_VERSION}.tar.gz" | sha256sum --check
tar xf "zlib-${ZLIB_VERSION}.tar.gz"

arch=${BABASHKA_ARCH:-"x86_64"}
echo "ARCH: $arch"

cd "zlib-${ZLIB_VERSION}"
CC=musl-gcc ./configure --static --prefix="/usr/local"
make CC=musl-gcc
make install
cd ..

# Install libz.a in the correct place so ldd can find it
install -Dm644 "/usr/local/lib/libz.a" "/usr/lib/$arch-linux-musl/libz.a"

ln -s /usr/bin/musl-gcc /usr/bin/x86_64-linux-musl-gcc