#!/bin/bash
# Copyright 2008-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# - solar

cross_wrap_etc() {
	local chost=$1
	cp -a __PREFIX__/share/crossdev/etc /usr/$chost/
	(cd /usr/$chost/etc ; ln -s /etc/make.globals make.globals )
	conf=/usr/$chost/etc/make.conf

	case $chost in
	i?86*)
		E_MACHINE=EM_X86
		ARCH=x86
		;;
	x86_64*)
		E_MACHINE=EM_X86_64
		ARCH=amd64
		;;
	arm*)
		E_MACHINE=EM_ARM
		ARCH=arm
		echo 'UCLIBC_CPU_DEFAULT="GENERIC_ARM"' >> ${conf}
		;;
	mips*)
		E_MACHINE=EM_MIPS
		ARCH=mips
		;;
	sh*)
		E_MACHINE=EM_SH
		ARCH=sh
		;;
	*)
		echo "!!! WARNING - Cannot auto-configure CHOST ${chost}"
		echo "!!! You should edit ${conf}"
		echo "!!! by hand to complete your configuration"
		E_MACHINE="__E_MACHINE__"
		ARCH="__ARCH__"
		;;
	esac

	[[ ${chost/gnu/} != $chost ]] && sed -i -e s/__LIBC__/glibc/g ${conf}
	[[ ${chost/uclibc/} != $chost ]] && sed -i -e s/__LIBC__/glibc/g ${conf}
	[[ $E_MACHINE != "" ]] && sed -i -e s/'#E_MACHINE=__E_MACHINE__'/E_MACHINE=${E_MACHINE}/g ${conf}
	[[ $ARCH != "" ]] && sed -i -e s/__ARCH__/${ARCH}/g ${conf}
	sed -i -e s/__CHOST__/${chost}/g -e s/__CBUILD__/${CBUILD}/g ${conf}
	echo MAKEOPTS=-j$(cat /proc/cpuinfo | grep processor| wc -l) >> ${conf}
	[[ ${portdir} != "" ]] && echo PORTDIR=\"${portdir}\" >> ${conf}
	[[ ${distdir} != "" ]] && echo DISTDIR=\"${distdir}\" >> ${conf}
	[[ ${overlay} != "" ]] && echo PORTDIR_OVERLAY=\"${overlay}\" >> ${conf}
	[[ -e /etc/make.conf ]] && grep ^GENTOO_MIRRORS= /etc/make.conf >> ${conf}
}

cross_init() {
	bn=$(basename $0)
	[[ $bn != emerge-wrapper ]] && { echo "I wont understand things" ; exit 1; }
	dn=$(dirname $(readlink -f $0))
	chosts=`ls -1 /usr/lib/gcc`
	cd $dn || { echo "Failed to cd to $dn" ; exit 1; }
	export overlay=$(portageq envvar PORTDIR_OVERLAY)
	export portdir=$(portageq envvar PORTDIR)
	export distdir=$(portageq envvar DISTDIR)

	for chost in $chosts; do
		[[ $chost == $CBUILD ]] && continue
		[[ $(type -p ${chost}-gcc) == "" ]] && continue
		echo " * Setting up symlinks for $chost"
		ln -sf emerge-wrapper emerge-${chost}
		ln -sf emerge-wrapper ${chost}-emerge
		ln -sf cross-pkg-config ${chost}-pkg-config
		if [ -d /usr/${chost} ] ; then
			if [[ ! -d /usr/${chost}/etc/ ]]; then
				echo " * Setting up cross basics in /usr/${chost}/etc"
				cross_wrap_etc $chost
			fi
		fi
	done
}

# CBUILD must be the first thing we export
export CBUILD=$(portageq envvar CBUILD)

if [[ $1 == "--init" ]]; then
	cross_init
	exit 0
fi

CHOST=$(basename $0)
CHOST=${CHOST/-emerge}
CHOST=${CHOST/emerge-}
export CHOST

if [[ $CHOST == wrapper ]]; then
	if [[ $1 == "--target" ]]; then
		export CHOST=$2
		shift 2
	else
		echo "After running this program with the --init option as root"
		echo "you can call it directly like emerge-wrapper --target CHOST <emerge options>"
		echo "or using the emerge-CHOST wrappers"
		exit 1
	fi
fi

[[ $(type -p ${CHOST}-gcc) == "" ]] && { echo "You need to 'crossdev $CHOST' first" ; exit 1; }

cross-emerge "$@"