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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| #!/usr/bin/env bash | ||
| # Use this script to test if a given TCP host/port are available | ||
|
|
||
| WAITFORIT_cmdname=${0##*/} | ||
|
|
||
| echoerr() { if [[ $WAITFORIT_QUIET -ne 1 ]]; then echo "$@" 1>&2; fi } | ||
|
|
||
| usage() | ||
| { | ||
| cat << USAGE >&2 | ||
| Usage: | ||
| $WAITFORIT_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 Don't 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 | ||
| } | ||
|
|
||
| wait_for() | ||
| { | ||
| if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then | ||
| echoerr "$WAITFORIT_cmdname: waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT" | ||
| else | ||
| echoerr "$WAITFORIT_cmdname: waiting for $WAITFORIT_HOST:$WAITFORIT_PORT without a timeout" | ||
| fi | ||
| WAITFORIT_start_ts=$(date +%s) | ||
| while : | ||
| do | ||
| if [[ $WAITFORIT_ISBUSY -eq 1 ]]; then | ||
| nc -z $WAITFORIT_HOST $WAITFORIT_PORT | ||
| WAITFORIT_result=$? | ||
| else | ||
| (echo > /dev/tcp/$WAITFORIT_HOST/$WAITFORIT_PORT) >/dev/null 2>&1 | ||
| WAITFORIT_result=$? | ||
| fi | ||
| if [[ $WAITFORIT_result -eq 0 ]]; then | ||
| WAITFORIT_end_ts=$(date +%s) | ||
| echoerr "$WAITFORIT_cmdname: $WAITFORIT_HOST:$WAITFORIT_PORT is available after $((WAITFORIT_end_ts - WAITFORIT_start_ts)) seconds" | ||
| break | ||
| fi | ||
| sleep 1 | ||
| done | ||
| return $WAITFORIT_result | ||
| } | ||
|
|
||
| wait_for_wrapper() | ||
| { | ||
| # In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692 | ||
| if [[ $WAITFORIT_QUIET -eq 1 ]]; then | ||
| timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --quiet --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT & | ||
| else | ||
| timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT & | ||
| fi | ||
| WAITFORIT_PID=$! | ||
| trap "kill -INT -$WAITFORIT_PID" INT | ||
| wait $WAITFORIT_PID | ||
| WAITFORIT_RESULT=$? | ||
| if [[ $WAITFORIT_RESULT -ne 0 ]]; then | ||
| echoerr "$WAITFORIT_cmdname: timeout occurred after waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT" | ||
| fi | ||
| return $WAITFORIT_RESULT | ||
| } | ||
|
|
||
| # process arguments | ||
| while [[ $# -gt 0 ]] | ||
| do | ||
| case "$1" in | ||
| *:* ) | ||
| WAITFORIT_hostport=(${1//:/ }) | ||
| WAITFORIT_HOST=${WAITFORIT_hostport[0]} | ||
| WAITFORIT_PORT=${WAITFORIT_hostport[1]} | ||
| shift 1 | ||
| ;; | ||
| --child) | ||
| WAITFORIT_CHILD=1 | ||
| shift 1 | ||
| ;; | ||
| -q | --quiet) | ||
| WAITFORIT_QUIET=1 | ||
| shift 1 | ||
| ;; | ||
| -s | --strict) | ||
| WAITFORIT_STRICT=1 | ||
| shift 1 | ||
| ;; | ||
| -h) | ||
| WAITFORIT_HOST="$2" | ||
| if [[ $WAITFORIT_HOST == "" ]]; then break; fi | ||
| shift 2 | ||
| ;; | ||
| --host=*) | ||
| WAITFORIT_HOST="${1#*=}" | ||
| shift 1 | ||
| ;; | ||
| -p) | ||
| WAITFORIT_PORT="$2" | ||
| if [[ $WAITFORIT_PORT == "" ]]; then break; fi | ||
| shift 2 | ||
| ;; | ||
| --port=*) | ||
| WAITFORIT_PORT="${1#*=}" | ||
| shift 1 | ||
| ;; | ||
| -t) | ||
| WAITFORIT_TIMEOUT="$2" | ||
| if [[ $WAITFORIT_TIMEOUT == "" ]]; then break; fi | ||
| shift 2 | ||
| ;; | ||
| --timeout=*) | ||
| WAITFORIT_TIMEOUT="${1#*=}" | ||
| shift 1 | ||
| ;; | ||
| --) | ||
| shift | ||
| WAITFORIT_CLI=("$@") | ||
| break | ||
| ;; | ||
| --help) | ||
| usage | ||
| ;; | ||
| *) | ||
| echoerr "Unknown argument: $1" | ||
| usage | ||
| ;; | ||
| esac | ||
| done | ||
|
|
||
| if [[ "$WAITFORIT_HOST" == "" || "$WAITFORIT_PORT" == "" ]]; then | ||
| echoerr "Error: you need to provide a host and port to test." | ||
| usage | ||
| fi | ||
|
|
||
| WAITFORIT_TIMEOUT=${WAITFORIT_TIMEOUT:-15} | ||
| WAITFORIT_STRICT=${WAITFORIT_STRICT:-0} | ||
| WAITFORIT_CHILD=${WAITFORIT_CHILD:-0} | ||
| WAITFORIT_QUIET=${WAITFORIT_QUIET:-0} | ||
|
|
||
| # Check to see if timeout is from busybox? | ||
| WAITFORIT_TIMEOUT_PATH=$(type -p timeout) | ||
| WAITFORIT_TIMEOUT_PATH=$(realpath $WAITFORIT_TIMEOUT_PATH 2>/dev/null || readlink -f $WAITFORIT_TIMEOUT_PATH) | ||
|
|
||
| WAITFORIT_BUSYTIMEFLAG="" | ||
| if [[ $WAITFORIT_TIMEOUT_PATH =~ "busybox" ]]; then | ||
| WAITFORIT_ISBUSY=1 | ||
| # Check if busybox timeout uses -t flag | ||
| # (recent Alpine versions don't support -t anymore) | ||
| if timeout &>/dev/stdout | grep -q -e '-t '; then | ||
| WAITFORIT_BUSYTIMEFLAG="-t" | ||
| fi | ||
| else | ||
| WAITFORIT_ISBUSY=0 | ||
| fi | ||
|
|
||
| if [[ $WAITFORIT_CHILD -gt 0 ]]; then | ||
| wait_for | ||
| WAITFORIT_RESULT=$? | ||
| exit $WAITFORIT_RESULT | ||
| else | ||
| if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then | ||
| wait_for_wrapper | ||
| WAITFORIT_RESULT=$? | ||
| else | ||
| wait_for | ||
| WAITFORIT_RESULT=$? | ||
| fi | ||
| fi | ||
|
|
||
| if [[ $WAITFORIT_CLI != "" ]]; then | ||
| if [[ $WAITFORIT_RESULT -ne 0 && $WAITFORIT_STRICT -eq 1 ]]; then | ||
| echoerr "$WAITFORIT_cmdname: strict mode, refusing to execute subprocess" | ||
| exit $WAITFORIT_RESULT | ||
| fi | ||
| exec "${WAITFORIT_CLI[@]}" | ||
| else | ||
| exit $WAITFORIT_RESULT | ||
| fi |
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