compose/wait_for_port.sh

#!/bin/sh
# ============LICENSE_START====================================================
#  Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
#  Modifications Copyright (C) 2022-2023 Nordix Foundation.
# =============================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
# ============LICENSE_END======================================================

usage() {
    echo args: [-t timeout] [-c command] hostname1 port1 hostname2 port2 ... >&2
    exit 1
}

tmout=300
cmd=
while getopts c:t: opt
do
    case "$opt" in
        c)
            cmd="$OPTARG"
            ;;

        t)
            tmout="$OPTARG"
            ;;

        *)
            usage
            ;;
    esac
done

nargs=$((OPTIND-1))
shift "$nargs"

even_args=$(($#%2))
if [ $# -lt 2 ] || [ "$even_args" -ne 0 ]
then
    usage
fi

while [ $# -ge 2 ]
do
    export host="$1"
    export port="$2"
    shift
    shift

    echo "Waiting for $host port $port..."

    while [ "$tmout" -gt 0 ]
    do
        if command -v docker > /dev/null 2>&1
        then
            docker ps --format "table {{ .Names }}\t{{ .Status }}"
        fi

        nc -vz "$host" "$port"
        rc=$?

        if [ $rc -eq 0 ]
        then
            break
        else
            tmout=$((tmout-1))
            sleep 1
        fi
    done

    if [ $rc -ne 0 ]
    then
        echo "$host port $port cannot be reached"
        exit $rc
    fi
done

$cmd

exit 0