#!/bin/sh
#
# Initial port bootstrap scripts
# bootstrap-stage1-install.sh
# Installs built stage 1 packages into a bootstrap system directory.
#
# 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

ARCH=
PLAT=

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

	cat <<-EOF

		Installing packages in stage 1...
		=================================
		EOF

	clean_root
	install_packages
	install_elf_interp_link
	install_archplat_sysconf
	configure_packages
	setup_root
}

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'
}

clean_root()
{
	[ -d root1 ] || return 0

	cd root1

	case "${ARCH}" in
		*-linux-*)
			sudo umount dev/pts || true
			sudo umount proc || true
			sudo umount sys || true
			sudo umount dev || true
			;;
	esac

	cd ..

	rm -Rf root1
}

install_packages()
{
	local opk pkg

	mkdir root1
	cd root1

	for opk in ../pkg/*_${ARCH}_${PLAT}.opk ../pkg/*_${ARCH}_all.opk \
			../pkg/*_all_${PLAT}.opk ../pkg/*_all_all.opk; do
		[ -f "${opk}" ] || continue
		pkg="${opk#../pkg/}"
		case "${pkg}" in
			"build-essential-${ARCH}_"*) ;;
			'build-essential-common_'*) ;;
			'build-essential-'*) continue ;;
			"gcc-${ARCH}_"*) ;;
			"gcc-"*"-${ARCH}_"*) ;;
			'gcc-'*'-common_'*) ;;
			'gcc-'*'-locales_'*) ;;
			'gcc-'*) continue ;;
			"g++-${ARCH}_"*) ;;
			"g++-"*"-${ARCH}_"*) ;;
			'g++-'*'-common_'*) ;;
			'g++-'*'-locales_'*) ;;
			'g++-'*) continue ;;
		esac
		log 'Installing package %s...' "${pkg%%_*}"
		tar -xzOf "${opk}" data.tar.gz | tar -xz
	done

	cd ..
}

install_elf_interp_link()
{
	local elf_interp

	cd root1

	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}"

	cd ..
}

install_archplat_sysconf()
{
	# TODO: The config-opkg package should provide these, but it isn't built
	# and installed here yet.

	cd root1

	mkdir -p etc
	printf '%s\n' "${ARCH}" >etc/proteanos_arch
	printf '%s\n' "${PLAT}" >etc/proteanos_plat
	mkdir -p etc/opkg
	printf 'arch all 1\narch %s 1\narch src 1\n' "${ARCH}" \
		>etc/opkg/opkg.conf

	cd ..
}

configure_packages()
{
	local opk pkg entry file

	cd root1

	info='var/lib/opkg/info'
	mkdir -p "${info}"

	for opk in ../pkg/*_${ARCH}_${PLAT}.opk ../pkg/*_${ARCH}_all.opk \
			../pkg/*_all_${PLAT}.opk ../pkg/*_all_all.opk; do
		[ -f "${opk}" ] || continue
		pkg="${opk#../pkg/}"
		case "${pkg}" in
			"build-essential-${ARCH}_"*) ;;
			'build-essential-common_'*) ;;
			'build-essential-'*) continue ;;
			"gcc-${ARCH}_"*) ;;
			"gcc-"*"-${ARCH}_"*) ;;
			'gcc-'*'-common_'*) ;;
			'gcc-'*'-locales_'*) ;;
			'gcc-'*) continue ;;
			"g++-${ARCH}_"*) ;;
			"g++-"*"-${ARCH}_"*) ;;
			'g++-'*'-common_'*) ;;
			'g++-'*'-locales_'*) ;;
			'g++-'*) continue ;;
		esac
		pkg="${pkg%%_*}"
		for entry in $(tar -xzOf "${opk}" control.tar.gz | tar -tz); do
			file="${entry##*/}"
			case "${file}" in
				preinst | postinst)
					tar -xzOf "${opk}" control.tar.gz | \
						tar -xzO "${entry}" \
						>"${info}/${pkg}.${file}"
					chmod a+x "${info}/${pkg}.${file}"
					log 'Running %s...' "${pkg}.${file}"
					sudo chroot . \
						"/${info}/${pkg}.${file}" \
						configure
					;;
			esac
		done
	done

	sudo chroot . chmod -R a+w /var/lib/opkg/alternatives

	cd ..
}

setup_root()
{
	cd root1

	case "${ARCH}" in
		*-linux-*)
			mkdir -p proc sys dev
			sudo mount -t proc proc proc
			sudo mount -t sysfs sys sys
			sudo mount -o bind /dev dev
			sudo mount -t devpts -o noexec,nosuid,gid=5,mode=0620 \
				devpts dev/pts
			;;
	esac

	# TODO: base-files will eventually handle this.
	mkdir -p tmp
	chmod 1775 tmp

	cd ..
}

main "${@}"