get_root_dir

#!/bin/bash

# ------------------------------------------------------------------------------
# usage
# ------------------------------------------------------------------------------
usage() {
    cat <<USAGE

    Usage: $0 <dir>

    Description:

        Get root directory based on OS and hostname

    Options:

        <dir>
            directory name. can be one of the following:
                kmk
                kmr
                kenrod


        -h, --help
            show this help message and exit

USAGE
    # exit 1
}

# ------------------------------------------------------------------------------
# parse args
# ------------------------------------------------------------------------------
# if no arguments supplied, show usage
if [ $# -eq 0 ]; then
    usage
    exit 1
fi

if [[ $1 == "-h" || $1 == "--help" ]]; then
    usage
    exit 0
fi

dir_list=(kmk kmr kenrod)
if [[ ! " ${dir_list[@]} " =~ " $1 " ]]; then
    # echo "error: unknown argument ($1)"
    usage
    bash error_msg "unknown argument ($1)"
fi

dir=$1

# ------------------------------------------------------------------------------
# main
# ------------------------------------------------------------------------------
os=`uname`
code_dir=`dirname $0`

hostname=${HOSTNAME}

if [[ ${hostname} =~ "compute-" || ${hostname} == "login-01" || ${hostname} =~ 'vdi-' ]]; then
    hostname=`get_cluster_name`
fi

if [[ ${os} == 'Linux' ]]; then
    root_dir=`cat ${code_dir}/root_dir.csv | grep ${dir} | grep ${os} | grep ${hostname} | awk -F, '{print $4}'`
elif [[ ${os} == 'Darwin' ]] || [[ ${os} == 'Windows_NT' ]]; then
    root_dir=`cat ${code_dir}/root_dir.csv | grep ${dir} | grep ${os} | awk -F, '{print $4}'`
fi
root_dir=`eval echo ${root_dir}`
if [[ -z ${root_dir} ]]; then
    error_msg "no root_dir found (os: ${os}; HOSTNAME: ${HOSTNAME}, hostname: ${hostname})"
elif [[ ! -e ${root_dir} ]]; then
    if [[ ${os} == 'Darwin' ]]; then
        root_dir=`echo ${root_dir} | sed "s|/Volumes|/Users/${USER}/mnt/cvl|g"`
    fi

    if [[ ! -e ${root_dir} ]]; then
        error_msg "file does not exist (${root_dir})"
    else 
        echo "${root_dir}"
    fi
else
    echo "${root_dir}"
fi