#!/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

# This script sets up the latest available musl-tools using apt pinning from debian unstable.
# The one available in stable and testing are quite outdated and this ensures we get the latest improvements
# This explictly installs musl from unstable and keeps the others at a higher priority

cat >> /etc/apt/sources.list <<eof
deb http://ftp.us.debian.org/debian unstable main non-free contrib
deb http://non-us.debian.org/debian-non-us unstable/non-us main contrib non-free
eof

cat >> /etc/apt/preferences <<eof
Package: *
Pin: release a=stable
Pin-Priority: 700
Package: *
Pin: release a=testing
Pin-Priority: 650
Package: *
pin: release a=unstable
pin-priority: 600
eof

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

ZLIB_VERSION="1.2.11"

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

echo "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1 zlib-${ZLIB_VERSION}.tar.gz" |
    sha256sum --check
tar xf "zlib-${ZLIB_VERSION}.tar.gz"

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

cd "zlib-${ZLIB_VERSION}"
CC=musl-gcc ./configure --static --prefix=/usr/lib/$arch-linux-musl/
make CC=musl-gcc
sudo make install
export CC=gcc
cd ..

# depending on GCC version, we will have different directories here.
# for example, for GCC 6.3.0 we will have:
# - /usr/lib/gcc/x86_64-linux-gnu/6
# - /usr/lib/gcc/x86_64-linux-gnu/6.3.0
for dest_dir in /usr/lib/gcc/$arch-linux-gnu/*; do
    sudo cp -f /usr/lib/$arch-linux-musl/lib/libz.a "$dest_dir"
done