#!/bin/sh
#
# Initial port bootstrap scripts
# bootstrap-prepare.sh
# Downloads, configures, and patches packages to be built.
#
# Copyright (C) 2013  Patrick "P. J." McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

SCRIPT_DIR=
ARCH=

main()
{
	SCRIPT_DIR="$(cd "${0%/*}" && pwd)"
	ARCH="$(cat /etc/proteanos_arch)"

	cat <<-EOF

		Preparing packages for bootstrap...
		===================================
		EOF

	prepare_packages_from_git
	prepare_packages_from_ftp
	patch_packages
	prepare_file_system
}

log()
{
	local msg i

	msg="$(printf "${@}")"
	printf '\n%s\n' "${msg}"
	i=0
	while [ ${i} -lt ${#msg} ]; do
		printf '-'
		i=$(($i + 1))
	done
	printf '\n\n'
}

prepare_packages_from_git()
{
	local repo

	[ -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 opkg opkbuild opkhelper-3.0 \
			fakeroot file m4 config-dev \
			expat gettext libunistring; do
		log 'Preparing package %s...' "${repo##*/}"
		if [ ! -d "${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="${ARCH}" ./config
		fi
		rm -f local.mk
		if [ -f source.mk -a ! -f "${repo##*/}"*.orig.tar* ]; then
			opkbuild -bCT source
		fi
		opkbuild -SC
		cd ..
	done

	cd ..
}

prepare_packages_from_ftp()
{
	local pkg src_opk path

	cd pkg

	for pkg in mpc mpfr; do
		log 'Preparing package %s...' "${pkg}"
		if [ ! -d "${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

	cd ..
}

patch_packages()
{
	local dir patch

	cd pkg

	for dir in */; do
		if [ -d "${SCRIPT_DIR}/patches/${dir}" ]; then
			log 'Patching package %s...' "${dir%/}"
			for patch in "${SCRIPT_DIR}/patches/${dir}"*; do
				patch -N -p 1 -u -d "${dir}" -i "${patch}" || \
					true
			done
		fi
	done

	cd ..
}

prepare_file_system()
{
	local ma dir

	if ma=$(dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null); then
		log 'Making multiarch directory links...'
		for dir in /lib /usr/lib /usr/include; do
			if [ ! -e "${dir}/${ARCH}" ]; then
				printf '%s/%s -> %s\n' \
					"${dir}" "${ARCH}" "${ma}"
				sudo ln -s "${ma}" "${dir}/${ARCH}"
			fi
		done
		printf '\n'
		log 'Overriding elf_interp macro in gcc-4.7 source package...'
		case "${ma}" in
			'x86_64-linux-gnu')
				interp='ld-linux-x86-64.so.2'
				;;
		esac
		printf 'Using %s...\n\n' /lib/${ARCH}/${interp:-ld-*.so.*}
		printf 'elf_interp = %s\n' /lib/${ARCH}/${interp:-ld-*.so.*} \
			>pkg/gcc-4.7/local.mk
	fi
}

main "${@}"