49 lines
1.4 KiB
Bash
49 lines
1.4 KiB
Bash
#!/bin/sh
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# This script will return 0 when on specific address (like 192.168.10.6:5000)
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# scanning will reveal that port is responding.
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#
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# Example usage:
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# ./wait_for.sh 192.168.10.6:5000 && ./start_service.sh
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# ./wait_for.sh 192.168.10.6:5000 || exit 1
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#
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# By default this script will check up to 24 times every 5 seconds.
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# You can overwrite this values with environment variables:
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# `WAIT_RETRIES`
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# `WAIT_INTERVAL`
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: "${WAIT_RETRIES:=24}"
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: "${WAIT_INTERVAL:=5}"
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wait_for() {
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echo "Waiting for $1 to listen on $2..."
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for i in $(seq $WAIT_RETRIES)
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do
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nc -z "$1" "$2" && return
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echo "$1 not yet ready (attempt $i of $WAIT_RETRIES)"
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sleep "$WAIT_INTERVAL"
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done
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echo "$1 failed to become ready, exiting..."
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exit 1
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}
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for var in "$@"
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do
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host=${var%:*}
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port=${var#*:}
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wait_for "$host" "$port"
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done
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