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

# helper script to select MPICH_PREFIX

# this script should be . included in a run_ script
# Input:
#   MPICH_PREFIX  - path to MPICH tools (optional)
# Output:
#   MPICH_PREFIX  - path to MPICH tools

valid_mpich_prefix()
{
	if [ -z "$MPICH_PREFIX" -o ! -e "$MPICH_PREFIX" -o ! -e "$MPICH_PREFIX"/bin ]
	then
		return 1
	fi
	if [ -e "$MPICH_PREFIX/bin/mpirun" -o -e "$MPICH_PREFIX/bin/mpdtrace" \
		-o -e "$MPICH_PREFIX/bin/mpirun_mpd" -o -e "$MPICH_PREFIX/bin/mpiexec" \
		-o -e "$MPICH_PREFIX/bin/mpirun_rsh" ]
	then
		return 0
	else
		return 1
	fi
}

# check all MPIs which start with $1 pathname and pick the 1st valid one
find_mpi()
{
	local mpich_prefix
	for mpich_prefix in $(ls -d $1/bin 2>/dev/null)
	do
		MPICH_PREFIX=$(dirname $mpich_prefix 2>/dev/null)
		if valid_mpich_prefix
		then
			break
		else
			MPICH_PREFIX=""
		fi
	done
}

# defaults we use for MPI (QuickSilver, openmpi, mvapich1, mvapich2)
if [ -z "$MPICH_PREFIX" ]
then
	if test -f /usr/lib/opa/bin/mpirun_rsh && ! rpm -q kernel-ib >/dev/null 2>&1
	then
		# QuickSilver MPI
		MPICH_PREFIX=/usr/lib/opa
	fi
	# by default MPI gets installed using same stack prefix as OFED
	prefix=$(/etc/infiniband/info 2>/dev/null|grep '^prefix='|cut -f2 -d=)
	prefix=${prefix:-/usr}	# in case $prefix not defined or not OFED
        MPICH_PREFIX=""
fi
export MPICH_PREFIX