#!/bin/bash
# exit when any command fails
set -e

error() {
    unset FUNCNAME[0] #remove this function name from callstack list
    echo "ERROR callstack(${FUNCNAME[@]}): $*" 1>&2
    exit 1
}

read_file() {
        #---check input parameters---#
        local path=$1
        #---read file to output varible---#
        local output="$(cat $path 2>&1)" status="$?"
        if [[ $status -ne 0 ]]; then
        error $output
                exit
    fi
    echo "$output"
}

test() {
   local io=$(read_file "/root/pve-zfs-clone/tests/test_file_1")
}
test
echo 567