#!/usr/bin/env bash
has() {
  command -v "$1" >/dev/null 2>&1
}

stop_dhclient() {
  local interface="$1"
  local pid_file="/var/run/dhclient.${interface}.pid"
  if [[ "$OSTYPE" == "linux-gnu" ]]; then
    dhclient -r -x
  elif [[ -f "$pid_file" ]
    kill "$(< $pid_file)"
  fi
}

if has dhcpcd; then
 dhcpcd -k "$INTERFACE"
elif has dhclient; then
 stop_dhcpclient "$INTERFACE"
elif [[ "$OSTYPE" == "darwin"* ]]; then # TODO untested
  ipconfig set "$interface" NONE
fi
exit 0