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This reverts commit 6196f4e.
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Jonathan Claudius
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Original file line number | Diff line number | Diff line change |
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#!/usr/bin/env bash | ||
# Use this script to test if a given TCP host/port are available | ||
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cmdname=$(basename $0) | ||
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echoerr() { if [[ $QUIET -ne 1 ]]; then echo "$@" 1>&2; fi } | ||
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usage() | ||
{ | ||
cat << USAGE >&2 | ||
Usage: | ||
$cmdname host:port [-s] [-t timeout] [-- command args] | ||
-h HOST | --host=HOST Host or IP under test | ||
-p PORT | --port=PORT TCP port under test | ||
Alternatively, you specify the host and port as host:port | ||
-s | --strict Only execute subcommand if the test succeeds | ||
-q | --quiet Dont 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 1 | ||
} | ||
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wait_for() | ||
{ | ||
if [[ $TIMEOUT -gt 0 ]]; then | ||
echoerr "$cmdname: waiting $TIMEOUT seconds for $HOST:$PORT" | ||
else | ||
echoerr "$cmdname: waiting for $HOST:$PORT without a timeout" | ||
fi | ||
start_ts=$(date +%s) | ||
while : | ||
do | ||
if [[ $ISBUSY -eq 1 ]]; then | ||
nc -z $HOST $PORT | ||
result=$? | ||
else | ||
(echo > /dev/tcp/$HOST/$PORT) >/dev/null 2>&1 | ||
result=$? | ||
fi | ||
if [[ $result -eq 0 ]]; then | ||
end_ts=$(date +%s) | ||
echoerr "$cmdname: $HOST:$PORT is available after $((end_ts - start_ts)) seconds" | ||
break | ||
fi | ||
sleep 1 | ||
done | ||
return $result | ||
} | ||
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wait_for_wrapper() | ||
{ | ||
# In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692 | ||
if [[ $QUIET -eq 1 ]]; then | ||
timeout $BUSYTIMEFLAG $TIMEOUT $0 --quiet --child --host=$HOST --port=$PORT --timeout=$TIMEOUT & | ||
else | ||
timeout $BUSYTIMEFLAG $TIMEOUT $0 --child --host=$HOST --port=$PORT --timeout=$TIMEOUT & | ||
fi | ||
PID=$! | ||
trap "kill -INT -$PID" INT | ||
wait $PID | ||
RESULT=$? | ||
if [[ $RESULT -ne 0 ]]; then | ||
echoerr "$cmdname: timeout occurred after waiting $TIMEOUT seconds for $HOST:$PORT" | ||
fi | ||
return $RESULT | ||
} | ||
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# process arguments | ||
while [[ $# -gt 0 ]] | ||
do | ||
case "$1" in | ||
*:* ) | ||
hostport=(${1//:/ }) | ||
HOST=${hostport[0]} | ||
PORT=${hostport[1]} | ||
shift 1 | ||
;; | ||
--child) | ||
CHILD=1 | ||
shift 1 | ||
;; | ||
-q | --quiet) | ||
QUIET=1 | ||
shift 1 | ||
;; | ||
-s | --strict) | ||
STRICT=1 | ||
shift 1 | ||
;; | ||
-h) | ||
HOST="$2" | ||
if [[ $HOST == "" ]]; then break; fi | ||
shift 2 | ||
;; | ||
--host=*) | ||
HOST="${1#*=}" | ||
shift 1 | ||
;; | ||
-p) | ||
PORT="$2" | ||
if [[ $PORT == "" ]]; then break; fi | ||
shift 2 | ||
;; | ||
--port=*) | ||
PORT="${1#*=}" | ||
shift 1 | ||
;; | ||
-t) | ||
TIMEOUT="$2" | ||
if [[ $TIMEOUT == "" ]]; then break; fi | ||
shift 2 | ||
;; | ||
--timeout=*) | ||
TIMEOUT="${1#*=}" | ||
shift 1 | ||
;; | ||
--) | ||
shift | ||
CLI=("$@") | ||
break | ||
;; | ||
--help) | ||
usage | ||
;; | ||
*) | ||
echoerr "Unknown argument: $1" | ||
usage | ||
;; | ||
esac | ||
done | ||
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if [[ "$HOST" == "" || "$PORT" == "" ]]; then | ||
echoerr "Error: you need to provide a host and port to test." | ||
usage | ||
fi | ||
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TIMEOUT=${TIMEOUT:-15} | ||
STRICT=${STRICT:-0} | ||
CHILD=${CHILD:-0} | ||
QUIET=${QUIET:-0} | ||
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# check to see if timeout is from busybox? | ||
# check to see if timeout is from busybox? | ||
TIMEOUT_PATH=$(realpath $(which timeout)) | ||
if [[ $TIMEOUT_PATH =~ "busybox" ]]; then | ||
ISBUSY=1 | ||
BUSYTIMEFLAG="-t" | ||
else | ||
ISBUSY=0 | ||
BUSYTIMEFLAG="" | ||
fi | ||
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if [[ $CHILD -gt 0 ]]; then | ||
wait_for | ||
RESULT=$? | ||
exit $RESULT | ||
else | ||
if [[ $TIMEOUT -gt 0 ]]; then | ||
wait_for_wrapper | ||
RESULT=$? | ||
else | ||
wait_for | ||
RESULT=$? | ||
fi | ||
fi | ||
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if [[ $CLI != "" ]]; then | ||
if [[ $RESULT -ne 0 && $STRICT -eq 1 ]]; then | ||
echoerr "$cmdname: strict mode, refusing to execute subprocess" | ||
exit $RESULT | ||
fi | ||
exec "${CLI[@]}" | ||
else | ||
exit $RESULT | ||
fi |