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#!/usr/bin/env bash
set -euo pipefail
help() {
cat <<EOF
Usage: ${0##*/} [-p] [-h] [HOST] PORT
Wait until specified PORT is available on HOST (localhost if HOST ommited).
-p print progress every second
-h print this help
EOF
}
main() {
show_progress=""
while getopts "ph" opt; do
case "${opt}" in
p)
show_progress=t
;;
h)
help
exit
;;
*)
help
exit 1
;;
esac
done
shift $((OPTIND - 1))
if [ $# -eq 2 ]; then
host="$1"
port="$2"
elif [ $# -eq 1 ]; then
port="$1"
else
echo "No host/port provided"
help
exit 1
fi
until nc -z "${host:-localhost}" "$port"; do
[ -n "$show_progress" ] && echo -n .
sleep 1
done
}
main "$@"
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