k3s/cluster/mesos/docker/common/bin/await-health-check

#!/usr/bin/env bash

# Copyright 2015 The Kubernetes Authors.
#
# 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.

# Wait for a service to accept connections.
# Block up to the timeout duration in seconds (default: 10).
# Usage: await-health-check [-t=<duration>] <address>
# Requires: timeout, health-check

set -o errexit
set -o nounset
set -o pipefail

duration=10
if [[ "${1:-}" == "-t="* ]]; then
    duration="${1:3}"
    [ -z "${duration}" ] && echo "Invalid duration supplied" && exit 1
    shift
fi

address=${1:-}
[ -z "${address}" ] && echo "No address supplied" && exit 1

bin=$(cd "$(dirname ${BASH_SOURCE})" && pwd -P)

echo "Waiting (up to ${duration}s) for ${address} to be healthy"
if ! timeout "${duration}" bash -c "while ! ${bin}/health-check ${address}; do sleep 0.5; done"; then
    echo "Timed out"
    exit 1
fi

echo "Health check of ${address} succeeded!"