UpdateController/general_utils

#!/bin/bash
# set -x 

source ./log_helpers

exec_process_substitution () {
    local func="${FUNCNAME[0]}"
    log_debug "$func:${LINENO} exec-ing [$*]"

    exec {fd}< <(eval "$@")

    local __result_code=$?
    local ps_pid=$!  # remember pid of process substitution

    local __result=""
    while read __tmp <&$fd; do
        if ! [ -z "$__tmp" ]; then
            __result="${__result}$__tmp"
        fi
    done
        
    exec {fd}>&-    # close fd (i.e. process substitution)
    wait $ps_pid    # wait for the subshell to finish

    __result=${__result//[$'\r\n\t']/ } # remove \r\n\t from __result

    log_debug "$func:${LINENO} result=$__result"
    printf '%s' "$__result"
    return $__result_code
}

usage () {
    echo "Usage: $PROGRAM [--file config] [--?] [--help] [--version] [--dbg]" 
    # UpdateController.conf"
}

usage_and_exit () {
    usage
    exit $1
}

version () {
    echo "$PROGRAM version $VERSION"
}

error () {
    echo "$@" 1>&2
    usage_and_exit 1
}