utils.sh

BOLD=$(tput bold)
RESET=$(tput sgr0)
BLACK=0 RED=1 GREEN=2 YELLOW=3 BLUE=4 MAGENTA=5 CYAN=6 WHITE=7
fg_color() { tput setaf "$1"; }
bg_color() { tput setab "$1"; }
print_bold() { echo -e "${BOLD}$(fg_color "$1")$(bg_color "$2")${*:3}${RESET}"; }

trap 'on_error $(basename $0) $LINENO' ERR

function log_info {
  echo -e "$(print_bold $GREEN $BLACK '[INFO]') $*"
}

function log_error {
  >&2 echo -e "$(print_bold $RED $YELLOW '[ERROR]') $*"
}

function on_error {
  log_error "$1 failed on line $2"
  if [[ $ERR_CONTEXT != "" ]]; then log_error "Context: $ERR_CONTEXT"; fi
}

function is_available {
  command -v "$1" >/dev/null
  return $?
}

# Asks for password upfront with an optional info message.
# If password attempts fails, returns failure exit status.
# Else repeatedly updates cached credentials until script exits.
function sudo_once {
  if [[ -n "$1" ]]; then
    log_info "$1"
  fi

  sudo -v && status=$? || status=$?
  [[ $status -ne 0 ]] && return $status

  while true; do sudo -v; sleep 30; kill -0 "$$" || exit; done 2>/dev/null &
}