#!/bin/bash

############################
#
# Author: Koustubha Bhat
# Date  : 3-April-2014
# VU University, Amsterdam.
#
############################

##################
# Initialization
##################

set -o errexit

MYPWD="`pwd`"
ARCH=i386
MINIX_ROOT=
MINIX_LLVM_DIR=
GOLD_DEST_DIR=
EXITCODE=0

function check_current_dir()
{
   #Make sure we are running from the root dir of the Minix sources
   if [ -d ./minix/drivers ] && [ -d ./minix/servers ] ; then
        MINIX_ROOT="${MYPWD}"
   elif [ -d ../../minix/drivers ] && [ -d ../../minix/servers ]; then
        MINIX_ROOT="${MYPWD}/../.."
   else
        echo "Please run the script from either of the following locations:"
        echo "> Root of the Minix sources."
        echo "          OR"
        echo "> minix/llvm directory of the Minix sources."
        exit 1
   fi

   MINIX_LLVM_DIR="${MINIX_ROOT}/minix/llvm"
   GOLD_DEST_DIR="${MINIX_ROOT}/minix/llvm/bin"

   MINIX_ROOT_1=`readlink -f ${MINIX_ROOT}`
   MINIX_DEST_DIR=`readlink -f ${MINIX_ROOT}/../obj.${ARCH}`
   MINIX_TOOLS_DIR="${MINIX_DEST_DIR}/tooldir.`uname -s`-`uname -r`-`uname -m`"
}

# Make sure we are running from the right directory
check_current_dir

# Create common.inc
if [ ! -f ${MINIX_LLVM_DIR}/common.inc ]; then
   echo "# This file was automatically generated by configure.llvm" > ${MINIX_LLVM_DIR}/common.inc
   echo "DESTDIR=\"${MINIX_DEST_DIR}\"" >> ${MINIX_LLVM_DIR}/common.inc
   echo "TOOLDIR=\"${MINIX_TOOLS_DIR}/bin\"" >> ${MINIX_LLVM_DIR}/common.inc
fi

STATIC_DIR="${MINIX_LLVM_DIR}/static"

if [ ! -f ${STATIC_DIR}/Makefile.common.inc ]; then
   echo "# This file was automatically generated by configure.llvm" > ${STATIC_DIR}/Makefile.common.inc
   echo "_MINIX_ARCH=${ARCH}" >> ${STATIC_DIR}/Makefile.common.inc
   echo "_MINIX_ROOT=${MINIX_ROOT_1}" >> ${STATIC_DIR}/Makefile.common.inc
   echo "_MINIX_TOOLS_DIR=${MINIX_TOOLS_DIR}" >> ${STATIC_DIR}/Makefile.common.inc
fi

. ${MINIX_LLVM_DIR}/minix.inc

# Set default values for essential variables
: ${JOBS=1}
: ${GEN_GOLD_PLUGIN="yes"}
: ${REBUILD_MINIX="yes"}
: ${GEN_STATIC_MAGIC="yes"}

########################
# Generate Gold Plugin
########################

if [ "${GEN_GOLD_PLUGIN}" == "yes" ] && [ -f "${MYPWD}/.gold_generated" ]; then
	GEN_GOLD_PLUGIN="no"
fi

if [ "${GEN_GOLD_PLUGIN}" == "yes" ]; then
        ${MINIX_LLVM_DIR}/generate_gold_plugin.sh 
	if [ ! -f "${GOLD_DEST_DIR}/libLTO.so" ] || [ ! -f "${GOLD_DEST_DIR}/LLVMgold.so" ]; then 
                echo "Failure: generate_gold_plugin.sh"
		exit 1
        fi

       	echo "Finished generating gold plugin."
        touch "${MYPWD}/.gold_generated"
else
	echo "Gold plugin generation: NO"
fi

########################
# Build Minix
########################
export BUILDVARS=$(echo "${BUILDVARS} -V MKBITCODE=yes"| sed -e 's,-V MKMAGIC=yes,-V DBG=-g -V STRIPFLAG=-s -V CPPFLAGS=-D_MINIX_MAGIC=1,')

if [ "${REBUILD_MINIX}" == "yes" ]; then

	echo "Building Minix..."
	echo "CC:$CC"
	echo "CXX:$CXX"
	echo "JOBS:$JOBS"
	echo "BUILDVARS:$BUILDVARS"
	echo 
	cd ${MINIX_ROOT}
	./releasetools/x86_hdimage.sh -b || EXITCODE=1
	cd ${MYPWD}
	if [ "$EXITCODE" != "0" ]; then
		echo "Error: Failed building Minix source code."
		exit $EXITCODE
	else
		echo "Completed building Minix source code."
	fi
else
	echo "Building Minix: NO"
fi

if [ "${GEN_STATIC_MAGIC}" == "yes" ]; then
	echo "Building static magic library..."
	cd ${STATIC_DIR}/magic
	make install || EXITCODE=1
	cd ${MYPWD}
	if [ "$EXITCODE" != "0" ]; then
		echo "Error: Failed building static magic library."
		exit $EXITCODE
	else
		echo "Completed building static magic library."
	fi
else
	echo "Building static magic library: NO"
fi

exit $EXITCODE