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#!/bin/sh

set -e

SCRIPT_DIR=
ARCH=
PLAT=

main()
{
	SCRIPT_DIR="$(cd "${0%/*}" && pwd)"
	setup_arch_plat
	prepare_packages
	stage1
}

setup_arch_plat()
{
	ARCH="$(cat /etc/proteanos_arch)"
	PLAT="$(cat /etc/proteanos_plat)"
}

prepare_packages()
{
	local repo pkg src_opk path dir

	[ -d pkg ] || mkdir pkg
	cd pkg

	for repo in zlib toolchains/binutils linux-libre eglibc \
			gmp toolchains/gcc-4.7 toolchains/gcc-defaults \
			busybox gmake; do
		if [ ! -d "${repo##*/}" ]; then
			git clone --depth 1 \
				"git://git.proteanos.com/pkg/${repo}.git"
		fi
		cd "${repo##*/}"
		git pull origin master
		if [ -x config ]; then
			./config clean
			PKG_TARGETS="${ARCH}" ./config
		fi
		if [ -f source.mk -a ! -f "${repo##*/}"*.orig.tar* ]; then
			opkbuild -bCT source
		fi
		opkbuild -SC
		cd ..
	done

	for pkg in mpc mpfr; do
		if [ ! -d "${pkg}" ]; then
			src_opk="src-${pkg}_*_src_all.opk"
			path="pub/pkg/${pkg}/${src_opk}"
			wget "ftp://files.proteanos.com/${path}"
			tar -xzOf ${src_opk} data.tar.gz | tar -xz
			mv "usr/src/${pkg}_"* "${pkg}"
		fi
	done
	[ -d usr/src ] && rmdir usr/src
	[ -d usr ] && rmdir usr

	for dir in */; do
		if [ -d "${SCRIPT_DIR}/patches/${dir}" ]; then
			for patch in "${SCRIPT_DIR}/patches/${dir}"*; do
				patch -N -p 1 -u -d "${dir}" -i "${patch}"
			done
		fi
	done

	cd ..
}

stage1()
{
	local dir opk elf_interp zlib_upstream_ver

	cd pkg

	for dir in */; do
		cd "${dir}"
		opkbuild -bC
		cd ..
	done

	cd ..

	[ -d "root_${ARCH}" ] && rm -Rf "root_${ARCH}"
	mkdir "root_${ARCH}"
	cd "root_${ARCH}"

	for opk in ../pkg/*_${ARCH}_${PLAT}.opk ../pkg/*_${ARCH}_all.opk \
			../pkg/*_all_${PLAT}.opk ../pkg/*_all_all.opk; do
		[ -f "${opk}" ] || continue
		tar -xzOf "${opk}" data.tar.gz | tar -xz
	done

	elf_interp="$(readelf -l bin/busybox | sed -n \
		's|^.*\[Requesting program interpreter: /\(.*\)\].*$|\1|p')"
	mkdir -p "${elf_interp%/*}"
	ln -sf "/lib/${ARCH}/${elf_interp##*/}" "${elf_interp}"

	sudo chroot . true
	sudo chroot . readelf -hl /usr/bin/readelf

	zlib_upstream_ver="$(printf '%s' ../pkg/zlib/zlib-*.orig.tar* | sed \
		's|^.*/zlib-\([a-z0-9.~]*\).*\.orig\.tar.*$|\1|')"
	tar -xjOf ../pkg/zlib/zlib-*.orig.tar* \
		"zlib-${zlib_upstream_ver}/examples/fitblk.c" >fitblk.c
	sudo chroot . "${ARCH}-gcc" -lz -o /fitblk /fitblk.c
	sudo chroot . /fitblk | grep -F 'fitblk abort' >/dev/null

	cd ..
}

main "${@}"