#!/bin/sh

set -eu

set -x

# : ${OPKG_LIBS:="-llzma -lldap -llber -lz -pthread"}
: ${OPKG_LIBS:="-lz -pthread -lzstd"}

generate_configure_id() {
    echo "$@" | sha256sum | awk '{ printf "build-opkg-%s", $1 }'
}

mark_configured() {
    rm -f build-opkg-*
    touch $1
}

# libarchive
[ -f libarchive-3.5.2.tar.gz ] || wget http://libarchive.org/downloads/libarchive-3.5.2.tar.gz
[ -d libarchive-3.5.2 ] || tar -xvf libarchive-3.5.2.tar.gz
cd libarchive-3.5.2
LIBARCHIVE_OPTS="\
--without-zlib \
--without-bz2lib \
--without-libb2 \
--without-lz4 \
--without-lzo2 \
--without-cng \
--without-nettle \
--without-xml2 \
--without-expat \
--with-zstd \
--disable-acl \
--disable-xattr \
--enable-posix-regex-lib=libc \
--disable-rpath \
--disable-bsdcat \
--disable-bsdtar \
--disable-bsdcpio \
--with-pic"
LIBARCHIVE_ID=$(generate_configure_id "$LIBARCHIVE_OPTS")
[ -f $LIBARCHIVE_ID ] || ( ./configure $LIBARCHIVE_OPTS && mark_configured $LIBARCHIVE_ID )
mkdir -p root && make -j$(nproc) install DESTDIR=$(realpath root)
cd ..

# curl
[ -f curl-7.79.1.tar.bz2 ] || wget https://curl.haxx.se/download/curl-7.79.1.tar.bz2
[ -d curl-7.79.1 ] || tar -xvf curl-7.79.1.tar.bz2
cd curl-7.79.1
CURL_OPTS=--with-openssl
CURL_ID=$(generate_configure_id "$CURL_OPTS")
[ -f $CURL_ID ] || ( ./configure $CURL_OPTS && mark_configured $CURL_ID )
mkdir -p root && make -j$(nproc) install DESTDIR=$(realpath root)
cd ..

# opkg
[ -f opkg-0.6.3.tar.gz ] || wget http://downloads.yoctoproject.org/releases/opkg/opkg-0.6.3.tar.gz
[ -d opkg-0.6.3 ] || tar -xvf opkg-0.6.3.tar.gz
cd opkg-0.6.3
OPKG_OPTS="\
--with-static-libopkg \
--without-libsolv \
--enable-curl \
--enable-openssl \
--enable-zstd \
--disable-gpg \
--disable-dependency-tracking"
OPKG_ID=$(generate_configure_id "$OPKG_OPTS" "$OPKG_LIBS")
[ -f $OPKG_ID ] || ( \
        AR_FLAGS=Tcru \
        PKG_CONFIG_PATH=$(realpath ../libarchive-3.5.2/root/usr/local/lib/pkgconfig/):$(realpath ../curl-7.79.1/root/usr/local/lib/pkgconfig/) \
        CURL_CFLAGS=-I$(realpath ../curl-7.79.1/root/usr/local/include/) \
        CURL_LIBS=$(realpath ../curl-7.79.1/root/usr/local/lib/libcurl.a) \
        LIBARCHIVE_CFLAGS=-I$(realpath ../libarchive-3.5.2/root/usr/local/include/) \
        LIBARCHIVE_LIBS=$(realpath ../libarchive-3.5.2/root/usr/local/lib/libarchive.a) \
        LIBS="$OPKG_LIBS" \
        ./configure $OPKG_OPTS && mark_configured $OPKG_ID \
    )
make -j$(nproc)
cd ..