Some Bash Utilities

utils.sh

# Set verbose level for .log function
# [0]="emerg"
# [1]="alert"
# [2]="crit"
# [3]="err"
# [4]="warning"
# [5]="notice"
# [6]="info"
# [7]="debug"
__VERBOSE=7

declare -A LOG_LEVELS
# https://en.wikipedia.org/wiki/Syslog#Severity_level
LOG_LEVELS=([0]="emerg" [1]="alert" [2]="crit" [3]="err" [4]="warning" [5]="notice" [6]="info" [7]="debug")

#.log <LEVEL> <STRING_TO_ECHO>
function .log () {
  local LEVEL=${1}
  shift
  if [ ${__VERBOSE} -ge "${LEVEL}" ]; then
    printf "[%s] %b\n" "${LOG_LEVELS[$LEVEL]}" "$@"
  fi
}

function check-for-sudo() {
    # Check if sudo/root permissions are available
    if [[ "$EUID" = 0 ]]; then
        .log 7 "(1) already root"
    else
        .log 6 "The script requires sudo/root access"
        sudo -k # make sure to ask for password on next sudo
        if sudo true; then
            .log 7 "(2) correct password"
        else
            .log 7 "(3) wrong password"
            .log 3 "Failed to gain sudo access. Exiting..."
            exit ${FAILURE}
        fi
    fi

    printf "\n\n"
}