#!/bin/bash

set -e

function check_executable {
    if [[ ! -x $1 ]] ; then
        echo could not find executable: $1
        exit 1
    fi
}

function check_directory {
    if [[ ! -d $1 ]] ; then
        echo could not find directory: $1
        exit 1
    fi
}

function check_environment {
    var=$1
    val=$(eval "echo \$$var")
    if [[ -z "$val" ]] ; then
        echo could not find environment variable: $var
        exit 1
    fi
}

function find_executable {
    if [[ -z "$(which $1)" ]] ; then
        echo could not find executable: $1
        exit 1
    fi
}

# check prerequisite environment variables
check_environment ROOT_BUILD_PATH
check_environment FABTEST_PATH
check_environment LIBFABRIC_BUILD_PATH
check_environment OMB_BUILD_PATH
check_environment MPICH_PATH

# check directories
check_directory $ROOT_BUILD_PATH
check_directory $OMB_BUILD_PATH
check_directory $MPICH_PATH
check_directory $SFT_INSTALL_PATH
check_directory $BATS_INSTALL_PATH

##### check prerequisite installed software packages
# SLURM     https://slurm.schedmd.com/
find_executable srun
# OMB       http://mvapich.cse.ohio-state.edu/benchmarks/
check_executable $OMB_BUILD_PATH/pt2pt/osu_bw
# Cray Proprietary
check_executable $SFT_INSTALL_PATH/bin/ci-all.sh
# BATS      https://github.com/bats-core/bats-core
check_executable $BATS_INSTALL_PATH/bats

exit 0