#!/bin/bash
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# [ICS VERSION STRING: unknown]

# rebuild selected MPI to target a specific compiler

Usage()
{
	echo "Usage: do_build [-d|-O|-C] [mpi [config_opt [install_dir]]]" >&2
	echo "        -d - use default settings for selected MPI's options" >&2
	echo "            if omitted, will be prompted for each option" >&2
	echo "        -O - build the MPI targeted for the OFI API." >&2
	echo "        -C - build the MPI targeted for the OFI API with CUDA support." >&2
	echo "        mpi - MPI to build (only openmpi)" >&2
	echo "        config_opt - a compiler selection option (gcc, pathscale, pgi or intel)" >&2
	echo "             if config_opt is not specified, the user will be prompted" >&2
	echo "             based on compilers found on this system" >&2
	echo "        install_dir - where to install MPI, see MPICH_PREFIX below" >&2
	echo "" >&2
	echo "Environment:" >&2
	echo "    STACK_PREFIX - where to find IEFS stack. Default is /usr" >&2
	echo "    BUILD_DIR - temporary directory to use during build of MPI" >&2
	echo "            Default is /var/tmp/Intel-openmpi" >&2
	echo "    MPICH_PREFIX - selects location for installed MPI" >&2
	echo "            default is /usr/mpi/<COMPILER>/<MPI>-<VERSION>" >&2
	echo "            where COMPILER is selected compiler (gcc, pathscale, etc above)" >&2
	echo "            MPI is currently only openmpi" >&2
	echo "            and VERSION is MPI version (eg. 1.0.0)" >&2
	echo "    CONFIG_OPTIONS - additional configuration options to be" >&2
	echo "            specified to srpm (not applicable to mvapich)" >&2
	echo "            Default is ''" >&2
	echo "    INSTALL_ROOT - location of system image in which to install." >&2
	echo "            Default is '/'" >&2
	echo "" >&2
	echo "The RPMs built during this process will be installed on this system" >&2
	echo "they can also be found in /usr/src/eth/MPI" >&2
	exit 2
}

build_opts=
while getopts "OCd" o
do
	case "$o" in
	d) build_opts="$build_opts -d";;
	O) build_opts="$build_opts -O";;
	C) build_opts="$build_opts -C";;
	*) Usage;;
	esac
done
shift $((OPTIND -1))
if [ $# -gt 3 ]
then
	Usage
fi

if [ "$(/usr/bin/id -u)" != 0 ]
then
	echo "You must be 'root' to run this program" >&2
	exit 1
fi
cd /usr/src/eth/MPI
if [ $? != 0 ]
then
	echo "Unable to cd to /usr/src/eth/MPI" >&2
	exit 1
fi

echo
echo "IEFS MPI Library/Tools rebuild"
mpi="$1"
compiler="$2"
if [ ! -z "$3" ]
then
	export MPICH_PREFIX="$3"
fi

nompi()
{
	echo "No MPI Build scripts Found, unable to Rebuild MPI" >&2
	exit 1
}

if [ -z "$mpi" ]
then
	choices=""
	for i in openmpi # mvapich2
	do
		if [ -e do_${i}_build ]
		then
			choices="$choices $i"
		fi
	done
	if [ x"$choices" = x ]
	then
		nompi
	else
		PS3="Select MPI to Build: "
		select mpi in $choices
		do
			case "$mpi" in
			mvapich2|openmpi) break;;
			esac
		done
	fi
fi

./do_${mpi}_build $build_opts "$compiler"
exit $?
