dockerfile/examples/standardnotes/official-src/server-main/packages/websockets/wait-for.sh

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#!/bin/sh
set -e
host="$1"
shift
port="$1"
shift
cmd="$@"
while ! nc -vz $host $port; do
>&2 echo "$host:$port is unavailable yet - waiting for it to start"
sleep 10
done
>&2 echo "$host:$port is up - executing command"
exec $cmd