#!/bin/sh TIMEOUT=15 QUIET=0 echoerr() { if [ "$QUIET" -ne 1 ]; then printf "%s\n" "$*" 1>&2; fi } usage() { exitcode="$1" cat << USAGE >&2 Usage: $cmdname host:port [-t timeout] [-- command args] -q | --quiet Do not output any status messages -t TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout -- COMMAND ARGS Execute command with args after the test finishes USAGE exit "$exitcode" } wait_for() { for i in `seq $TIMEOUT` ; do nc -z "$HOST" "$PORT" > /dev/null 2>&1 result=$? if [ $result -eq 0 ] ; then if [ $# -gt 0 ] ; then exec "$@" fi exit 0 fi sleep 1 done echo "Operation timed out" >&2 } while [ $# -gt 0 ] do case "$1" in *:* ) HOST=$(printf "%s\n" "$1"| cut -d : -f 1) PORT=$(printf "%s\n" "$1"| cut -d : -f 2) shift 1 ;; -q | --quiet) QUIET=1 shift 1 ;; -t) TIMEOUT="$2" if [ "$TIMEOUT" = "" ]; then break; fi shift 2 ;; --timeout=*) TIMEOUT="${1#*=}" shift 1 ;; --) shift break ;; --help) usage 0 ;; *) echoerr "Unknown argument: $1" usage 1 ;; esac done if [ "$HOST" = "" -o "$PORT" = "" ]; then echoerr "Error: you need to provide a host and port to test." usage 2 fi while true; do wait_for "$@" done