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@@ -0,0 +1,177 @@
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+#!/usr/bin/env bash
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+# Use this script to test if a given TCP host/port are available
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+
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+cmdname=$(basename $0)
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+
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+echoerr() { if [[ $QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }
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+
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+usage()
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+{
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+ cat << USAGE >&2
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+Usage:
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+ $cmdname host:port [-s] [-t timeout] [-- command args]
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+ -h HOST | --host=HOST Host or IP under test
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+ -p PORT | --port=PORT TCP port under test
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+ Alternatively, you specify the host and port as host:port
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+ -s | --strict Only execute subcommand if the test succeeds
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+ -q | --quiet Don't output any status messages
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+ -t TIMEOUT | --timeout=TIMEOUT
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+ Timeout in seconds, zero for no timeout
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+ -- COMMAND ARGS Execute command with args after the test finishes
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+USAGE
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+ exit 1
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+}
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+
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+wait_for()
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+{
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+ if [[ $TIMEOUT -gt 0 ]]; then
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+ echoerr "$cmdname: waiting $TIMEOUT seconds for $HOST:$PORT"
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+ else
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+ echoerr "$cmdname: waiting for $HOST:$PORT without a timeout"
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+ fi
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+ start_ts=$(date +%s)
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+ while :
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+ do
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+ if [[ $ISBUSY -eq 1 ]]; then
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+ nc -z $HOST $PORT
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+ result=$?
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+ else
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+ (echo > /dev/tcp/$HOST/$PORT) >/dev/null 2>&1
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+ result=$?
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+ fi
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+ if [[ $result -eq 0 ]]; then
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+ end_ts=$(date +%s)
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+ echoerr "$cmdname: $HOST:$PORT is available after $((end_ts - start_ts)) seconds"
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+ break
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+ fi
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+ sleep 1
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+ done
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+ return $result
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+}
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+
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+wait_for_wrapper()
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+{
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+ # In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692
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+ if [[ $QUIET -eq 1 ]]; then
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+ timeout $BUSYTIMEFLAG $TIMEOUT $0 --quiet --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
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+ else
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+ timeout $BUSYTIMEFLAG $TIMEOUT $0 --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
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+ fi
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+ PID=$!
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+ trap "kill -INT -$PID" INT
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+ wait $PID
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+ RESULT=$?
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+ if [[ $RESULT -ne 0 ]]; then
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+ echoerr "$cmdname: timeout occurred after waiting $TIMEOUT seconds for $HOST:$PORT"
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+ fi
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+ return $RESULT
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+}
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+
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+# process arguments
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+while [[ $# -gt 0 ]]
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+do
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+ case "$1" in
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+ *:* )
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+ hostport=(${1//:/ })
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+ HOST=${hostport[0]}
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+ PORT=${hostport[1]}
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+ shift 1
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+ ;;
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+ --child)
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+ CHILD=1
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+ shift 1
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+ ;;
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+ -q | --quiet)
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+ QUIET=1
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+ shift 1
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+ ;;
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+ -s | --strict)
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+ STRICT=1
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+ shift 1
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+ ;;
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+ -h)
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+ HOST="$2"
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+ if [[ $HOST == "" ]]; then break; fi
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+ shift 2
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+ ;;
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+ --host=*)
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+ HOST="${1#*=}"
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+ shift 1
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+ ;;
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+ -p)
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+ PORT="$2"
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+ if [[ $PORT == "" ]]; then break; fi
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+ shift 2
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+ ;;
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+ --port=*)
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+ PORT="${1#*=}"
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+ shift 1
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+ ;;
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+ -t)
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+ TIMEOUT="$2"
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+ if [[ $TIMEOUT == "" ]]; then break; fi
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+ shift 2
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+ ;;
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+ --timeout=*)
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+ TIMEOUT="${1#*=}"
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+ shift 1
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+ ;;
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+ --)
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+ shift
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+ CLI=("$@")
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+ break
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+ ;;
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+ --help)
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+ usage
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+ ;;
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+ *)
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+ echoerr "Unknown argument: $1"
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+ usage
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+ ;;
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+ esac
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+done
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+
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+if [[ "$HOST" == "" || "$PORT" == "" ]]; then
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+ echoerr "Error: you need to provide a host and port to test."
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+ usage
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+fi
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+
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+TIMEOUT=${TIMEOUT:-15}
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+STRICT=${STRICT:-0}
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+CHILD=${CHILD:-0}
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+QUIET=${QUIET:-0}
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+
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+# check to see if timeout is from busybox?
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+# check to see if timeout is from busybox?
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+TIMEOUT_PATH=$(realpath $(which timeout))
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+if [[ $TIMEOUT_PATH =~ "busybox" ]]; then
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+ ISBUSY=1
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+ BUSYTIMEFLAG="-t"
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+else
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+ ISBUSY=0
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+ BUSYTIMEFLAG=""
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+fi
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+
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+if [[ $CHILD -gt 0 ]]; then
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+ wait_for
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+ RESULT=$?
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+ exit $RESULT
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+else
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+ if [[ $TIMEOUT -gt 0 ]]; then
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+ wait_for_wrapper
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+ RESULT=$?
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+ else
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+ wait_for
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+ RESULT=$?
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+ fi
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+fi
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+
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+if [[ $CLI != "" ]]; then
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+ if [[ $RESULT -ne 0 && $STRICT -eq 1 ]]; then
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+ echoerr "$cmdname: strict mode, refusing to execute subprocess"
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+ exit $RESULT
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+ fi
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+ exec "${CLI[@]}"
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+else
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+ exit $RESULT
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+fi
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