Created
July 24, 2019 14:47
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sh native way to wait for dependencies on docker-compose that can be used with alpines:
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#!/bin/sh | |
# Use this script to test if a given TCP host/port are available | |
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 | |
exit 1 | |
} | |
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 "$PORT" = "" ]; then | |
echoerr "Error: you need to provide a host and port to test." | |
usage 2 | |
fi | |
wait_for "$@" |
Hi! Thanks for sharing. I am using this script for years now… and now I am wanting to shipping it with an open-source product.
So I saw just now there is no licence mention in this snippet (should check earlier, my bad).
Can I suggest APGL-v3 ?
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usage:
command: /bin/sh -c "/usr/bin/env chmod +x /project/wait-for-it.sh && /project/wait-for-it.sh <SOME_DB_NAME>:<SOME_PORT> -t 20 -- java -jar app.jar"